Journal
APPLIED SCIENCES-BASEL
Volume 11, Issue 14, Pages -Publisher
MDPI
DOI: 10.3390/app11146501
Keywords
GdFeCo; alloy; atomistic spin simulation; spin transfer torque
Categories
Funding
- National Natural Science Foundation of China (NSFC) [61432007]
- Creative Research Group Project of NSFC [61821003]
- Science Technology Support Program of Hubei Province [2015BCE054]
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This study demonstrates that the laser induced spin transfer torque dominates the magnetization reversal of the Fe sublattice in Gd25Fe75 alloy, and the switching speed of the Gd25Fe75 alloy is correlated with the amount of spin current.
Featured Application All-Optical magnetization recording technology. All-optical magnetic switching (AOS) provides a novel approach to improve writing ability and energy efficiency compared to those utilized in the mainstream magnetic data storage products. Rare earth-transition metals (RE-TM) exhibit extremely fast magnetization switching induced by one single incident linearly polarized laser pulse; however, the mechanism is still ambiguous. Here, we show by atomistic spin simulation that the laser induced spin transfer torque dominates the magnetization reversal of Fe sublattice in Gd25Fe75 alloy, and that the switching speed of Gd25Fe75 alloy is relevant to the amount of spin current. This implies that a possible helicity independent mechanism underlies the RE-TM alloy AOS process. We also find that the greater the spin current density the faster the magnetization switching, and the time magnetization reversal of Gd and Fe takes is also affected by the spin current density.
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