Unambiguous separation of the inverse spin Hall and anomalous Nernst Effects within a ferromagnetic metal using the spin Seebeck effect

Abstract

The longitudinal spin Seebeck effect is measured on the ferromagnetic insulator Fe${}_3$O${}_4$ with the ferromagnetic metal Co${}_{0.2}$Fe${}_{0.6}$B${}_{0.2}$ (CoFeB) as the spin detector. By using a non-magnetic spacer material between the two materials (Ti), it is possible to decouple the two ferromagnetic materials and directly observe pure spin flow from Fe${}_3$O${}_4$ into CoFeB. It is shown, that in a single ferromagnetic metal the inverse spin Hall effect (ISHE) and anomalous Nernst effect (ANE) can occur simultaneously with opposite polarity. Using this and the large difference in the coercive fields between the two magnets, it is possible to unambiguously separate the contributions of the spin Seebeck effect from the ANE and observe the degree to which each effect contributes to the total response. These experiments show conclusively that the ISHE and ANE in CoFeB are separate phenomena with different origins and can coexist in the same material with opposite response to a thermal gradient.

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• Spin Seebeck insulator
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Cited by in corpus (11)

• Interface-Induced Phenomena in Magnetism
• Antiferromagnetic spin Seebeck Effect
• Thermoelectric generation based on spin Seebeck effects
• Large Spin Anomalous Hall Effect in L1${}_0$-FePt: Symmetry and Magnetization Switching
• Quantitative disentanglement of spin Seebeck, proximity-induced and intrinsic anomalous Nernst effect in NM/FM bilayers
• Spin Seebeck devices using local on-chip heating
• Sign change in the tunnel magnetoresistance of Fe3O4/MgO/Co-Fe-B magnetic tunnel junctions depending on the annealing temperature and the interface treatment
• Separation of inverse spin Hall effect and anomalous Nernst effect in ferromagnetic metals
• Spin-dependent (inverse) spin Hall effect in Co${}_{60}$Fe${}_{20}$B${}_{20}$
• Temperature dependence of the Spin Seebeck effect in a mixed valent manganite
• Enhancement of Spin-Charge Conversion Efficiency for Co${}_3$Sn${}_2$S${}_2$ across Transition from Paramagnetic to Ferromagnetic Phase