Observation of spin-current striction in a magnet

Area of Science:

• Magnetism and Material Physics
• Spintronics
• Nanotechnology

Background:

• The relationship between magnetization and solid deformation is crucial in magnetism.
• Controlling material volume and shape is essential for advanced actuators in precision machinery and nanotechnology.

Purpose of the Study:

• To demonstrate the spin current volume effect (SVE), where spin currents manipulate the volume of solids.
• To explore the potential of SVE in developing new mechanical drivers.

Main Methods:

• Utilizing a Tb$_{0.3}$Dy$_{0.7}$Fe$_{2}$ magnet with strong spin-lattice coupling.
• Injecting spin current via spin Hall effects to induce volume changes.
• Employing theoretical calculations to model spin-current induced magnetization fluctuations.

Main Results:

• Successfully demonstrated that the sample volume changes in response to injected spin current.
• Observed a significant spin current volume effect in the magnet.
• Theoretical calculations accurately reproduced the experimental findings.

Conclusions:

• The spin current volume effect (SVE) offers a novel method for controlling the volume of solids.
• SVE technology can be integrated into spintronics for the development of mechanical drivers.
• This research expands the application of spintronics beyond electronics to mechanical actuation.