Wednesday 09 April 2025
Scientists have long been fascinated by the potential for spin superfluidity, a phenomenon that would allow for the creation of low-dissipative spin currents without significant loss over long distances. In recent years, researchers have made significant progress towards realizing this concept in antiferromagnetic materials, which lack net magnetization and are less prone to dipolar interactions that disrupt spin transport.
A new study published today in Nature offers a major breakthrough in this area, demonstrating the ability to excite Néel vector rotation in an amorphous ferrimagnetic GdCo thin film using spin-orbit torque. This achievement represents a crucial step towards the realization of spin superfluidity and has significant implications for the development of novel electronic devices.
The researchers achieved this feat by applying an external magnetic field along the easy-axis direction, inducing a spin-flop transition in the material. They then injected spin currents into the film using a pulsed current technique, which caused the local magnetic moments to tilt out of the easy-plane. This tilt generated an internal antiferromagnetic exchange field that drove the Néel vector rotation within the magnetic easy-plane.
The team observed stochastic binary switching in the anomalous Hall resistance, directly attributed to the Néel vector rotation. To confirm this phenomenon, they performed homodyne detection measurements using the anomalous Hall effect, which revealed rotation frequencies in the GHz range consistent with atomic spin simulations.
These results demonstrate the ability to control and manipulate the Néel vector rotation in an amorphous ferrimagnetic material using spin-orbit torque. This achievement opens up new possibilities for the development of novel electronic devices that exploit the unique properties of spin superfluidity, such as low-dissipative spin currents and high-frequency spin dynamics.
The study’s findings also have significant implications for the development of spin-based logic and memory technologies. By harnessing the power of spin-orbit torque, researchers may be able to create more efficient and reliable spin-based devices that can operate at higher frequencies and with lower energy consumption.
While much work remains to be done before spin superfluidity is fully realized, this breakthrough represents a major step forward in the development of novel spin-based technologies. As researchers continue to push the boundaries of what is possible with spin-orbit torque, we can expect to see even more innovative applications emerge in the years to come.
Cite this article: “Unlocking the Secrets of Magnetic Memory: Researchers Discover New Way to Manipulate Nanomagnets”, The Science Archive, 2025.
Spin Superfluidity, Spin-Orbit Torque, Antiferromagnetic Materials, Ferrimagnetic Gdco Thin Film, Néel Vector Rotation, Anomalous Hall Resistance, Homodyne Detection, Spin Dynamics, Low-Dissipative
