Spin-orbit torque lowers a ferrimagnet's compensation temperature without changing its composition
Researchers at DGIST, Shinshu University and Vietnam National University Ho Chi Minh City (VNU-HCM) have shown that the compensation temperature of a ferrimagnetic cobalt-gadolinium (CoGd) film can be lowered electrically. Instead of changing the alloy’s composition or thickness, the team used spin-orbit torque (SOT) to rearrange the spins inside the film. The size of the shift could be set by the amplitude and duration of the current pulses. The researchers suggest this could enable ferrimagnetic memory devices whose magnetic properties are tailored locally, after fabrication.
In a ferrimagnet such as CoGd, the cobalt and gadolinium sublattices are magnetized in opposite directions. At the compensation temperature, the two cancel out and the net magnetization drops to zero. Near that point, ferrimagnets switch efficiently under SOT and show fast spin dynamics, which makes the compensation temperature a key design parameter for ferrimagnetic spintronics. It is normally fixed by composition or film thickness, or adjusted by processes such as annealing, hydrogen exposure or ion migration. These approaches are either slow or cannot target specific locations within a finished device.
Source: https://www.spintronics-info.com/spin-orbit-torque-lowers-ferrimagnets-compensation-temperature-without-changing
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