Researchers Electrically Tuned Ferrimagnetic Film Properties
A new spin-orbit torque method enables local control of magnetic compensation temperatures in memory-ready thin films.
Updated on Sept. 28, 2026 in Materials Science
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Researchers at DGIST, Shinshu University, and Vietnam National University Ho Chi Minh City have demonstrated a method to electrically alter the compensation temperature of ferrimagnetic cobalt-gadolinium (CoGd) films. This research, published in September 2026, allows for site-specific magnetic tuning without altering material composition.
Why it matters
The ability to locally tailor magnetic properties in ferrimagnetic materials enables the development of high-density memory devices with greater functional versatility. This advancement provides a path for non-volatile storage components that can be configured after the manufacturing process is complete.
A 60 mA, 50 ms current pulse through a platinum layer lowered the compensation temperature of a Co0.68Gd0.32 film from 140-150 K down to 80-90 K. Researchers confirmed these changes occurred only at current densities exceeding 10^11 A/m2, while control devices utilizing gold exhibited no such shift.
The players
DGIST
A South Korean science and technology research institute focused on advanced materials and device engineering.
Shinshu University
A Japanese research university specializing in materials science and spintronics applications.
Vietnam National University Ho Chi Minh City
A leading research university in Vietnam contributing to fundamental condensed matter and materials studies.
The details
The researchers employed spin-orbit torque—a phenomenon where current-induced spin currents exert force on a magnetic layer—to manipulate the spin configuration in Pt/IrMn3/CoGd multilayers. By sending current through the platinum layer, the team triggered a noncollinear spiral spin configuration in the cobalt and gadolinium sublattices, effectively reducing the net magnetic compensation. IrMn3 acts as an antiferromagnetic pinning layer that selectively couples to cobalt, allowing the researchers to twist the internal spin alignment to tune the thermal properties of the film.
Timeline
September 28, 2026: Findings were published on spintronics-info.com.
The Tech Race
This development follows the trajectory of SOT-MRAM research, which aims to replace conventional spin-transfer torque switching with more energy-efficient electrical methods. It marks a departure from static memory fabrication by demonstrating that critical material parameters can be tuned post-deposition.
This research is currently in the experimental stage and does not affect consumer electronics or hardware availability today. It provides a foundational mechanism that developers and semiconductor engineers may eventually use to build more dense and versatile non-volatile memory architectures.
The takeaway
This technique provides a novel way to manipulate magnetic states using electrical pulses rather than material doping. Researchers should monitor future studies for evidence of long-term bit stability and the ability to perform these adjustments at lower current densities.
Further reading
For broader context on magnetic thin-film research, explore the Materials Science archives.
Source note: This article includes information reported by Spintronics-info.
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