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.

An unprecedented nationwide data collection will show where storms and wildfires are causing large insurer losses and rate hikes.

Colombia and the Netherlands will pass the baton to Ireland and Tuvalu to carry on what nearly 60 countries hope becomes a new form of multilateral cooperation.

The Trump administration has been circulating flyers at this week’s gathering of the International Maritime Organization.

Legislators in at least 28 states this year introduced bills that would roll back tax incentives for the energy-hungry facilities.

Oil producers are facing a May 7 deadline to stop gas from burning off at some newer wells.

A Democratic bill would give Congress the authority to override presidential rejections of recovery aid.

The EPA administrator achieved a string of viral moments to play up online, which could serve his ambitions beyond the agency.

Researchers have reverse-engineered a piece of malware named Fast16. It’s almost certainly state-sponsored, probably US in origin, and was deployed against Iran years before Stuxnet:

“…the Fast16 malware was designed to carry out the most subtle form of sabotage ever seen in an in-the-wild malware tool: By automatically spreading across networks and then silently manipulating computation processes in certain software applications that perform high-precision mathematical calculations and simulate physical phenomena, Fast16 can alter the results of those programs to cause failures that range from faulty research results to catastrophic damage to real-world equipment.”...

Trucking fleets are buying Tesla’s lower-cost, higher-range electric big rig — and boosting the state’s climate goals.

The European Commission is considering temporary relief from methane penalties as energy firms warn of supply risks.

Host cities, stadiums and FIFA are working to protect players and spectators by conducting heat risk assessments, enhancing shade and more.

The work at Blue Hill Observatory and Science Center serves not just to keep weather records, but also to connect ordinary people to climate science.

The UN Special Rapporteur on the situation of human rights in the Palestinian territories occupied since 1967 recently announced a study addressing the killings and attacks against Palestinian journalists and media workers, the destruction of media infrastructure in Gaza, and the production and dissemination of narratives that may enable, justify, or incite international crimes. 

As part of this consultation, EFF contributed a submission that identifies a significant deterioration of press freedom and free expression in the period since October 2023, including an increase in censorship and wave of killings of journalists; adding to an already pervasive censorship and surveillance regime for Palestinians. 

In particular, concerns raised in our submission relate to:

1. Government takedown requests 
2. Disinformation and content moderation
3. Attacks on internet infrastructure

The concerns about censorship in Palestine are ever increasing, and include multiple international forums. Ending the deliberate digital isolation of the Palestinian people is critical to protecting fundamental human rights.

Read the briefing in full here.

A U.S. citizen who teaches Persian poetry classes online is suddenly unable to receive payments or access funds when his account is flagged and frozen by Paypal and its subsidiary Venmo. A Muslim city councilwoman in New York City has a Venmo payment blocked because she uses the name of a Bangladeshi restaurant in the transaction. Online hubs for erotic storytelling repeatedly lose their payment accounts. Others active in drug legalization fights struggle to keep their bank accounts.

These may sound like one-off issues, but they are not. They occur with frightening regularity, as former EFF Activism Director and Chief Program Officer, Rainey Reitman, who left EFF in 2022, describes in her new book, Transaction Denied. The book sheds new light on a serious problem that often hides in the shadows, and pushes us to ask an increasingly important question: “Is it ever OK for financial intermediaries to act as the arbiters of online expression?"  

Both a storyteller and an advocate, Rainey exposes hidden systems of power that shape our choices, our speech, and, ultimately, our society. - Cindy Cohn

Reitman makes her case about the impact of financial institutions and payment intermediaries shutting down accounts and inhibiting transactions through compelling individual stories, some of which have not been shared before. The people impacted are diverse: authors, teachers, journalists, elected politicians, and more are suddenly unable to retrieve or receive funds, with little explanation, transparency, or recourse. Reitman shows the reasons are frequently speech-related, resulting often from arbitrary corporate policy, a broad (mis)interpretation of the law, or in response to pressure from anti-speech advocates. 

In the example of the Persion poetry teacher, the blocking is due to the highly risk averse interpretation of U.S. sanctions on Iran—sanctions aimed at deterring weapons development or terrorism instead snared a poetry professor and a New York city councilwoman.  Reitman demonstrates how these sanctions, and others, have an outsized impact on Muslims.

But Transaction Denied is also a guide for those interested in fighting for free speech. The book covers over a decade of successful campaigns and shows that advocacy can win the day—and is sometimes necessary to counter pro-censorship campaigns. Reitman offers a behind-the-scenes view of the campaign to help restore the Stripe account of the Nifty Archive Alliance, a nonprofit which supports the Nifty Archive, a hub of erotic storytelling for the queer community since 1992. She covers EFF's successful coalition and campaign to restore the PayPal account of Smashwords, a hub for self-published fiction. And in what has become a critical moment for free speech and free press, she describes how several EFF staff members and two EFF board members became the seed for a new nonprofit, the Freedom of the Press Foundation, which continues to partner with EFF today in advancing the rights of journalists.

It’s a banner time for books by EFF staff members and friends. If you're concerned about how online privacy has changed over the last three decades, read EFF Executive Director Cindy Cohn's book, Privacy Defender, released in May. (All proceeds from the sale of hard copies of Privacy’s Defender are being donated to EFF, so your book order will help EFF continue fighting for the principles Cindy holds dear.) If you are worried about the individuals trapped in a system where massive financial companies can shut down their individual accounts, effectively locking up their access to money, based entirely on their speech, grab Transaction Denied, released earlier this month, at Beacon Press, Amazon, and Bookshop.org. (Half of the author proceeds go to Freedom of the Press Foundation.) 

More likely—you'll want both books on your shelf. Happy reading! 

A new immersive sound installation at Oulu Cathedral, Finland, brings the research of MIT astrophysicist and associate professor of physics Kiyoshi Masui into a striking sensory form, transforming more than 4,000 cosmic signals into spatial audio.

With its grand opening on April 4, “The Logos” project invites visitors to experience deep-space phenomena not as distant abstractions, but as something immediate and resonant. The work is led by artist and creative technologist Andrew Melchior in collaboration with Masui, philosopher Timothy Morton, and cathedral dean Satu Saarinen. Together, they treat the cathedral, built in 1832, not just as a setting but as part of the instrument itself. Its stone surfaces and reverberant acoustics give physical presence to signals that have traveled from distant galaxies.

At the heart of the installation are data gathered by the Canadian Hydrogen Intensity Mapping Experiment (CHIME) radio telescope, which detects fast radio bursts (FRBs). FRBs are immensely energetic flashes lasting only milliseconds and originating in distant galaxies across the observable universe. The Logos represents one of the most extensive artistic sonifications of FRB data to date. Each day at noon, the cathedral is filled with a one-hour procedural composition derived from these bursts. Some bursts are singular events, never repeating, while others pulse again and again from unknown sources. These patterns remain one of astrophysics’ most compelling mysteries.

“The fast flashes will echo as snare-like beats bouncing through the cathedral,” says Masui. “The sweeping dispersion of the signal — where different radio frequencies arrive at slightly different times — creates harmonies between high and low tones. It should feel rich and layered, while also revealing something real about how these signals travel across billions of years of cosmic space before reaching Earth.”

By converting FRB data into a shared listening experience, the collaboration suggests a different way of understanding the universe: not only through analysis, but through attention.

Running through April 2027 to mark the cathedral’s 250th anniversary, The Logos will feature as part of Oulu2026 European Capital of Culture and the Lumo Art and Tech Festival. 

Cherry Tang, a master of science in real estate development student at the MIT Center for Real Estate, recently participated in an experiential learning opportunity in Panama working with Conservatorio, a development firm based in Casco Viejo. What began as a modeling exercise quickly became a deeper exploration of how development, community, and environment intersect, shaped as much by people and culture as by the work itself.

“I went in expecting to build a financial model. I didn’t expect that the experience would fundamentally reshape how I think about development,” Tang reflects.

The project centered on Santa Catalina, a remote surf town on Panama’s Pacific coast. The development comprises approximately 140 residential units across condos, villas, and homes, along with vacant lots, four retail spaces, a surf school with a stadium, and a restaurant with a pool — all envisioned as the town’s first true center.

At first glance, Tang says, Santa Catalina didn’t resemble a typical “prime” development market. It had limited infrastructure, low density, and no established core.

“What it does have is something powerful: world-class surf and access to Coiba National Park, a premier diving destination,” Tang says. “Here, the ocean becomes the anchor tenant.”

The project is designed as an open, walkable master-planned community that integrates seamlessly with the existing town. Anchored by surfing and diving, it introduces a diverse product mix and a 600-meter linear park, positioning it as the future heart of Santa Catalina and a differentiated alternative to both local developments and traditional resort-style communities.

Tang saw this as a different vision of place-making. “It wasn’t about building a resort. It was about building a center of gravity for a community that has never really had one.”

Tang’s primary role was to build the project’s financial model from the ground up. The capital structure, with land contributed as equity and sales deposits used to fund construction, required a different way of thinking than the institutional frameworks she had used in previous roles in Toronto and Boston.

“It was more than a technical exercise,” she explains. “It reinforced how financial, physical, and strategic decisions are deeply interconnected, and how thoughtful structuring can unlock projects that might otherwise not be feasible.”

Working directly with KC Hardin, founder and CEO of Conservatorio, and the broader leadership team, Tang gained firsthand exposure to real-time development decision-making. She presented her financial model to leadership and prospective investors, and her assumptions helped shape conversations around phasing, design, and construction.

“Development is a feedback loop between underwriting and the built environment,” Tang says.

Throughout the month, Tang and her colleagues met with a range of people shaping the project’s future. They spent time with local developers and brokers, learning about infrastructure improvements and ongoing real estate activity in the region. 

Tang described meeting one family with long-standing ties to the area as one of the more memorable moments.

“Their coastline conservation work in Panama is deeply inspiring,” she says.

They also met with scientists from the Smithsonian Tropical Research Institute, trekking through mangroves and learning about coastal ecosystems and the long-term environmental implications of development.

“It was a vivid reminder that development decisions don’t exist in isolation,” says Tang.

Outside of work, Panama had its way of leaving an impression. Sailing through the Panama Canal ... watching cargo ships pass through landscapes filled with monkeys and sloths ... living in Casco Viejo — each added another layer to the experience for Tang. The neighborhood itself served as a real-life case study in thoughtful, community-oriented development.

“What stayed with me most was Conservatorio’s approach to revitalization, not through displacement, but through deep engagement, trust-building, and creating pathways for local residents to be part of the area’s transformation.”

That same spirit was reflected in everyday moments, from co-workers who went out of their way to make interns feel welcome.

“Strangers greeted us like neighbors,” says Tang. “The level of warmth and hospitality defined the experience as much as the work itself.”

By the end of the month, the experience left her with more than technical skills — she had a shift in perspective.

“I began to see development less as a formula and more as a system,” she explains. “One that sits at the intersection of finance, design, environment, and community.”

Her takeaway is that value can be created in unconventional ways, and leadership in real estate is grounded in trust, curiosity, and a deep respect for place.

Tang arrived in Panama to build a model. She left with a deeper understanding of what it means to build thoughtfully — as a developer, and as a steward of place.

Government lawyers sided with gas companies urging the justices to revisit a decision by a lower bench that upheld the rules.

Delegates pointed to the Iran war — and the resulting energy crisis — as a reason to transition away from fossil fuels.

The final report could propose transformations to federal disaster aid. But it comes as the president has eased his criticism of the emergency response agency.