Strain and Thermally Induced Magnetic Dynamics and Spin Current in Magnetic Insulators Subject to Transient Optical Grating

Frontiers in Materials

Jamal Berakdar¹  Levan Chotorlishvili¹  Xi-Guang Wang¹ 

[1] Institute of Physics, Martin Luther University Halle-Wittenberg, Halle, Germany;

关键词: magnonic spin current;    optical grating;    elastic wave;    laser pulses;    micromagnetic simulations;    spintronics;   

DOI  :  10.3389/fmats.2017.00019

来源: DOAJ

【 摘 要 】

We analyze the magnetic dynamics and particularly the spin current in an open-circuit ferromagnetic insulator irradiated by two intense, phase-locked laser pulses. The interference of the laser beams generates a transient optical grating and a transient spatiotemporal temperature distribution. Both effects lead to elastic and heat waves at the surface and into the bulk of the sample. The strain induced spin current as well as the thermally induced magnonic spin current are evaluated numerically on the basis of micromagnetic simulations using solutions of the heat equation. We observe that the thermo-elastically induced magnonic spin current propagates on a distance larger than the characteristic size of thermal profile, an effect useful for applications in remote detection of spin caloritronics phenomena. Our findings point out that exploiting strain adds a new twist to heat-assisted magnetic switching and spin-current generation for spintronic applications.

【 授权许可】

Unknown