Journal
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
Volume 496, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jmmm.2019.165920
Keywords
Macrospin model; Spin Hall angle; Anisotropy field; Current induced switching
Funding
- National Key R&D Program of China [2017YFB0405700, 2017YFA0303400]
- NSFC [11474272, 11604325, 61774144]
- Chinese Academy of Sciences [QYZDY-SSW-JSC020, XDA18000000, XDB28000000]
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We developed equations to estimate the spin Hall angle and anisotropy field of ferromagnets in heavy metal/ferromagnet heterostructures using a macrospin model. In this model, critical switching spin current density linearly changes with the applied in-plane magnetic field. Thus the spin Hall angles can be estimated by measuring the critical switching current density under in-plane magnetic field. The obtained spin Hall angle using this method is not only consistent with that obtained by harmonic measurements. Spin Hall angles of PtMn, beta-W, Pt and (Bi0.5Sb0.5)(2)Te-3 estimated by our method are also closed to that obtained using other different methods. Therefore, estimating spin Hall angle by macrospin model can be considered a simple, feasible and widely-applicable approach to obtain the spin Hall angle.
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