Transistors, the building blocks of modern electronics, are typically made of silicon. Because it’s a semiconductor, this material can control the flow of electricity in a circuit. But silicon has fundamental physical limits that restrict how compact and energy-efficient a transistor can be.

MIT researchers have now replaced silicon with a magnetic semiconductor, creating a magnetic transistor that could enable smaller, faster, and more energy-efficient circuits. The material’s magnetism strongly influences its electronic behavior, leading to more efficient control of the flow of electricity. 

The team used a novel magnetic material and an optimization process that reduces the material’s defects, which boosts the transistor’s performance.

The material’s unique magnetic properties also allow for transistors with built-in memory, which would simplify circuit design and unlock new applications for high-performance electronics.

“People have known about magnets for thousands of years, but there are very limited ways to incorporate magnetism into electronics. We have shown a new way to efficiently utilize magnetism that opens up a lot of possibilities for future applications and research,” says Chung-Tao Chou, an MIT graduate student in the departments of Electrical Engineering and Computer Science (EECS) and Physics, and co-lead author of a paper on this advance.

Chou is joined on the paper by co-lead author Eugene Park, a graduate student in the Department of Materials Science and Engineering (DMSE); Julian Klein, a DMSE research scientist; Josep Ingla-Aynes, a postdoc in the MIT Plasma Science and Fusion Center; Jagadeesh S. Moodera, a senior research scientist in the Department of Physics; and senior authors Frances Ross, TDK Professor in DMSE; and Luqiao Liu, an associate professor in EECS, and a member of the Research Laboratory of Electronics; as well as others at the University of Chemistry and Technology in Prague. The paper appears today in Physical Review Letters.

Overcoming the limits

In an electronic device, silicon semiconductor transistors act like tiny light switches that turn a circuit on and off, or amplify weak signals in a communication system. They do this using a small input voltage.

But a fundamental physical limit of silicon semiconductors prevents a transistor from operating below a certain voltage, which hinders its energy efficiency.

To make more efficient electronics, researchers have spent decades working toward magnetic transistors that utilize electron spin to control the flow of electricity. Electron spin is a fundamental property that enables electrons to behave like tiny magnets.

So far, scientists have mostly been limited to using certain magnetic materials. These lack the favorable electronic properties of semiconductors, constraining device performance.

“In this work, we combine magnetism and semiconductor physics to realize useful spintronic devices,” Liu says.

The researchers replace the silicon in the surface layer of a transistor with chromium sulfur bromide, a two-dimensional material that acts as a magnetic semiconductor.

Due to the material’s structure, researchers can switch between two magnetic states very cleanly. This makes it ideal for use in a transistor that smoothly switches between “on” and “off.”

“One of the biggest challenges we faced was finding the right material. We tried many other materials that didn’t work,” Chou says.

They discovered that changing these magnetic states modifies the material’s electronic properties, enabling low-energy operation. And unlike many other 2D materials, chromium sulfur bromide remains stable in air.

To make a transistor, the researchers pattern electrodes onto a silicon substrate, then carefully align and transfer the 2D material on top. They use tape to pick up a tiny piece of material, only a few tens of nanometers thick, and place it onto the substrate.

“A lot of researchers will use solvents or glue to do the transfer, but transistors require a very clean surface. We eliminate all those risks by simplifying this step,” Chou says.

Leveraging magnetism

This lack of contamination enables their device to outperform existing magnetic transistors. Most others can only create a weak magnetic effect, changing the flow of current by a few percent or less. Their new transistor can switch or amplify the electric current by a factor of 10.

They use an external magnetic field to change the magnetic state of the material, switching the transistor using significantly less energy than would usually be required.

The material also allows them to control the magnetic states with electric current. This is important because engineers cannot apply magnetic fields to individual transistors in an electronic device. They need to control each one electrically.

The material’s magnetic properties could also enable transistors with built-in memory, simplifying the design of logic or memory circuits.

A typical memory device has a magnetic cell to store information and a transistor to read it out. Their method can combine both into one magnetic transistor.

“Now, not only are transistors turning on and off, they are also remembering information. And because we can switch the transistor with greater magnitude, the signal is much stronger so we can read out the information faster, and in a much more reliable way,” Liu says.

Building on this demonstration, the researchers plan to further study the use of electrical current to control the device. They are also working to make their method scalable so they can fabricate arrays of transistors.

This research was supported, in part, by the Semiconductor Research Corporation, the U.S. Defense Advanced Research Projects Agency (DARPA), the U.S. National Science Foundation (NSF), the U.S. Department of Energy, the U.S. Army Research Office, and the Czech Ministry of Education, Youth, and Sports. The work was partially carried out at the MIT.nano facilities.

Imagine if McDonald’s could use trademark law to control how you use the term “fast food.” Or if the Canadian government could stop you from using the word “Canada” in the title of a book about the country and its people. That wouldn’t just be absurd; it would be an unacceptable obstacle to criticism of and commentary about those institutions. Yet the Church of Jesus Christ of Latter-day Saints (the “LDS Church”) has a track record of claiming exactly that kind of authority over the word “Mormon,” using the threat of expensive litigation to pressure speakers into compliance.

We at EFF have opposed the LDS Church’s abuse of trademark law for over a decade. In 2014, we filed an amicus brief when the church sued an online dating service for church members called Mormon Match. In 2016, it threatened legal action against our client the Mormon Mental Health Association, a nonprofit association for mental health professionals who work with members of Mormon faiths. In 2025, the church tried to pressure our client Burke Sorenson into changing the name of his Mormon News Roundup podcast. Now, the LDS Church has brought a lawsuit over a podcast called Mormon Stories that examines Mormonism and Mormon culture. With the help of attorneys at Ballard Spahr, EFF has filed an amicus brief in the case.

Our brief urges the district court to dismiss the case as soon as possible. Trademark is supposed to be about helping consumers identify the sources of the products they buy, not controlling criticism. That’s why our brief asks the court to use a test that’s more protective of speech than what’s applied in most trademark cases. This test, known as the Rogers test, has been adopted by many courts (but not yet this one) for cases where someone is using a trademark as part of an expressive work, rather than just as a brand name. We explain to the court that the Rogers test is an important First Amendment safeguard in part because it makes it easier to throw out meritless trademark claims before the most expensive parts of litigation, allowing more speakers to confidently stand up for their rights.

Our brief goes on to explain that First Amendment safeguards are especially important in cases like this one, where a plaintiff is seeking to control the use of a common term for its common meaning. Trademark law isn’t even supposed to extend to generic terms, and for good reason. Otherwise, we risk giving trademark owners power to control discussion and debate over entire topics.

It’s about time that a court shut down the LDS Church’s trademark bullying. We hope the court will do so here, while also taking the opportunity to endorse the Rogers test.

Access to accurate information about reproductive and maternal health can be critical. But on Meta's platforms, simply talking about prescription medication, abortion care, or one's own medical experiences can be enough to trigger content removals and account restrictions.

That's why EFF recently submitted a public comment to the Meta Oversight Board in its consideration of a case involving an Instagram post about prescription drugs during pregnancy and childbirth. The case touches upon a topic we’ve been documenting for some time; last year we collected stories from individuals who had experienced censorship of reproductive health information on various platforms. Meta in particular stood out: Its moderation systems routinely fail to distinguish between prohibited drug transactions and legitimate discussion of medications, including educational information and people's firsthand experiences with healthcare.

Through our Stop Censoring Abortion project, EFF collected nearly 100 submissions from healthcare providers, clinics, educators, advocates, researchers, and others whose reproductive health content had been removed or suppressed by social media platforms. What we found was alarming: systemic over-enforcement, confusing policies, arbitrary takedowns, sudden account bans, de-ranking, and appeals that too often went nowhere.

Talking About Medication Isn't the Same as Selling It

In almost every case we reviewed, the censored posts and accounts did not actually violate the platforms' stated rules. Meta frequently cited its Restricted Goods and Services policy, which prohibits attempts to buy, sell, trade, donate, gift, or request pharmaceutical drugs. But the content EFF documented overwhelmingly consisted of factual or educational information—not attempts to sell or distribute drugs.

The consequences were significant. For example, the Miscarriage+Abortion Hotline had its Instagram account restricted and posts removed even though it was providing information about legally obtaining medication rather than offering pharmaceuticals for sale. Red River Women's Clinic and the RISE reproductive health research center at Emory University had accounts locked after posting about mifepristone.

Other users reported having their content quietly de-ranked or “shadowbanned,” limiting its reach without giving them meaningful notice or recourse. We believe educational content and people's experiences involving reproductive healthcare and medication should not be suppressed in this way.

And when Meta gets these decisions wrong, the appeals process too often fails to fix them. In several cases EFF documented, accounts were restored only after journalists drew attention to the problem or someone with a personal connection inside Meta intervened. A moderation system shouldn't require knowing the right person to get an erroneous decision reversed.

Meta Can—and Must—Do Better

Our submission calls on Meta to make five changes—the same five changes we asked for last year.

First, Meta should publish clear, understandable policies so users can know what content is permitted and what might result in removal, downranking, or account suspension. Second, those rules must be enforced consistently and fairly. Third, Meta must provide meaningful explanations for enforcement decisions, including what rule was violated and how users can appeal. Fourth, users need a functional appeals system that doesn't depend on insider access.

Finally, Meta should expand human review. Reproductive healthcare is precisely the sort of nuanced and context-dependent subject that automated moderation systems struggle to understand. As our research shows, automated systems can mistake education for drug sales, misinterpret terminology, overlook cultural and political context, and even classify legitimate advocacy as dangerous content. Human moderators should therefore play a greater role when automated systems flag sensitive healthcare information or political expression.

Meta has chosen to allow discussion of reproductive healthcare, including abortion, on its platforms. That commitment means little if its moderation systems nevertheless prevent people from accessing or sharing that information.

At a moment when reproductive rights are under attack around the world, the stakes are particularly high. Restricting access to essential healthcare information can have profound consequences, especially for people who already face barriers to reproductive care.

Users deserve a system in which rules aren't applied arbitrarily, appeals actually work, and vital health information isn't silenced because an automated system failed to understand its context. Meta can—and must—do better.

You can read our comment in full below.

This is good:

Post-quantum cryptography is now one pip-install away for the entire Python ecosystem. With funding from the Sovereign Tech Agency, we implemented support for ML-KEM, the NIST-standard key-establishment primitive, and ML-DSA, the NIST-standard digital-signature primitive, in pyca/cryptography.

Remember, the reason to do this now is because there’s no emergency. And because you will make your systems crypto agile, which is always a good idea.

Some environmentalists are looking to rebuild a cordial relationship with Gov. Kathy Hochul as they look for alignment after a bitter fight over the state’s climate law.

Cameron Hamilton's arrival Monday as FEMA's first permanent administrator in Donald Trump's second term portends changes to disaster aid.

The California governor made his first public remarks detailing his priorities for this year on the issue.

The agency said it reached an agreement with groups affected by billions of dollars in frozen funds. Money will not flow while the case goes through the appeals process.

Gov. Spencer Cox has drawn support across the political spectrum for "Operation Gigawatt” as his state tries to plan for surging power demand.

Dry seasons have become a fixture of European farming. The EU’s crisis tools still treat them as a surprise.

The Maldives has championed itself as a country fighting its vulnerability to climate change, but the government has said sacrifices must be made at times in favor of development.

The Bureau of Reclamation said that water from Glen Canyon Dam would not be released “due to significant hydropower generation concerns under already strained system conditions."

Heavy rains have created a risk of severe flooding in Zhejiang province, and authorities have warned of severe landslide risks.

Nature Climate Change, Published online: 10 August 2026; doi:10.1038/s41558-026-02735-5

Author Correction: Enduring impacts of El Niño on life expectancy in past and future climates

Nature Climate Change, Published online: 10 August 2026; doi:10.1038/s41558-026-02724-8

The authors quantify the global emergence of hourly heat extremes (HHEs), highlighting exposure overlooked by daily metrics. HHEs will increase fourfold by the end of the century under high emissions, with low- and middle-income countries, as well as successive generations, facing disproportionate exposure.

In the last decade, scientists have shown that fusion energy can work, as a physical process. Next question: Can it work economically? 

A study co-authored by MIT professors Dennis Whyte and Andrew W. Lo proposes a framework for understanding what’s needed to make fusion energy commercially viable in the marketplace. The method considers the physical inputs needed to sustain controlled fusion energy production, as well as the cost of building power plants that can compete in energy markets.

“It’s all the things that come along with finding, allocating, and spending money at this scale,” says Whyte, a professor of nuclear science and engineering at MIT and a key driver of the field’s progress, who co-authored the paper. “This is critical to what we do. We should look at the economics. If we want this technology to actually be meaningful in the world economy, we have to start getting straight with ourselves about these topics.” 

The goal of the paper, Whyte says, is to create “this framework, where are all the economics are clear, and then we understand what it would mean” for any fusion energy power plant. 

Fusion energy harnesses the reaction that powers the stars: the fusion of light nuclei. It is often referred to as “plasma fusion,” as the fusion reactions generate fuel in a plasma state, often confined by magnets or initiated by powerful lasers. Whyte says the goal is to generate abundant energy while also offering society attractive safety, licensing, and siting options.

In 2022, researchers at the National Ignition Facility in Livermore, California, one of the U.S. national labs, achieved a reaction with positive energy gain. Venture funding has also poured into the field in recent years, although there are still many challenges regarding the construction of viable commercial fusion energy.

“It’s challenging to reduce complex scientific and engineering requirements to economic consequences,” Lo says. “But if we don’t do that, we’re not going to get the funding we need to achieve the impact we want.”

The open-access publication, “Criteria for the economic viability of fusion power plants,” appears online in the Journal of Fusion Energy. The authors are Whyte, who is the Hitachi America Professor of Engineering and a professor of nuclear science and engineering at MIT; Lo, who is the Charles E. and Susan T. Harris Professor and a professor of finance at the MIT Sloan School of Management; Rachel Bielajew, an analyst with Rutherford Energy Ventures and a researcher at MIT’s Plasma Science and Fusion Center; Maria Hancock and Riley Moeykens of Rutherford Energy Ventures; and Guinevere Shaw of Rutherford Energy Ventures and MIT’s Plasma Science and Fusion Center.

Whyte is a former head of MIT’s Department of Nuclear Science and Engineering and a former director of MIT’s Plasma Science and Fusion Center. He co-founded Commonwealth Fusion Systems, an MIT spinoff firm that is one of the leaders in the fusion industry. Whyte and Lo also co-founded Rutherford Energy Ventures, a consultancy and investment advisory firm, which is working with the U.S. Department of Energy’s Oak Ridge National Laboratory to build a consortium for new fusion research. 

10 parameters, any power plant

The framework Whyte and Lo propose in the paper has 10 parameters for evaluating the economic viability of a fusion energy power plant. Some of these are scientific and physical, dealing with the energy consumed and produced in a given plant. Most of the parameters are in the realm of engineering and economics, such as the costs of plant construction.

A key inspiration for the framework is the so-called Lawson Criterion, derived in the 1950s, which describes the combinations of temperature, plasma density, and energy confinement time that can produce net energy from the plasma due to fusion, regardless of its absolute power or volume. Specifically it calculates a “plasma Q,” which is the ratio of fusion power produced to the external power required to sustain the plasma.

“The Lawson Criterion describes the scientific success of energy gain from fusion plasmas, while our framework generally describes economic Q, which is the ratio of capital gained to that expended,” Whyte explains.

The parameters in the framework describe engineering features of the fusion power plant such as power density, the efficiency of converting fusion power into an economic product, and the durability of components used in the energy conversion, in addition to costing and market parameters that assess the expenses and returns from invested capital. Or, as Whyte puts it, the framework is centered on what it takes to achieve a net-positive economic return, “but applied to practical power plant design.” In parallel to plasma Q, the economic Q described in the framework must be greater than 1 for basic viability.

Researchers have tried a variety of methods for generating and containing fusion energy. The paper’s framework, Whyte emphasizes, is “completely agnostic to whatever fusion concept you use, because the physical reality of fusion is that you expend money to build the capability to produce fusion power.” And the parameters do not depend on the size of any reactor being built; the framework is set up so that any inputs can be scaled to a given project or power output. 

“It doesn’t matter whether the fusion power plant is a small or large, the bottom line is: In both cases you better have money coming out that exceeds the money going in, otherwise it’s not going to be around for very long,” Lo says. 

One source of motivation for the paper, Whyte and Lo say, is to underscore the importance of accounting for all costs in fusion research as rigorously as possible. While researchers will be highly aware of the costs of basic experiments, estimating the costs of a fusion reactor is a somewhat different matter, but something leaders in the field have to be increasingly oriented around.

Fixing a missing link

That is certainly the case, the authors note, as new rounds of funding enter the fusion energy industry. Just last week, Commonwealth Fusion Systems obtained a new billion-dollar round of funding support from investors; it hopes to open its first working power plant in the 2030s, in the state of Virginia. 

Lo acknowledges that there will be uncertainties and challenging decisions involved in the development of the very first commercial fusion reactor. If successful, though, the industry might follow the path of learning by doing that has been common in energy and other industries, helping plants become more economical over time. 

“This pattern of learning by doing exists in all deep technology sectors,” says Lo, noting that sequencing a human genome is a million times cheaper right now than it was about 25 years ago. “We’re going to see the same thing, but maybe not to the same degree, in fusion energy.”

Lo has long worked to develop ways for scientific research to gain financial support in biotechnology — and is launching a new MIT Sloan educational program, called CATAPULT, to provide more tools for people in any field of study to translate their research advances into products. 

When it comes to fusion, Lo says, “It’s pretty clear that economic viability is something we can start assessing now.” And while there might be thousands of particular decisions involved in building a commercial fusion plant, the authors think they have an overall approach that will let people quantify all that work. 

“When you’ve got a framework to evaluate it in a quantitative way, it tells you about the literal worth of making a particular design decision. That seems to me at this moment of fusion development absolutely critical, and what we’ve been missing,” Whyte says.

Nice video of the Arctic bobtail squid.

As usual, you can also use this squid post to talk about the security stories in the news that I haven’t covered.

Blog moderation policy.

Through data brokers, ICE is buying the information you provided to open a credit card.

A fight over USDA immigration and diversity policies held up $15 million in wildfire-prevention grants for an area in Washington state that’s now burning.

Occidental Petroleum's project in West Texas was supposed to start in late 2024. Scientists say carbon removal is essential to slowing climate change.