Dresden 2017 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 64: Poster 1
MA 64.29: Poster
Freitag, 24. März 2017, 09:30–13:00, P2-EG
Spin Hall magnetoresistance in a non-collinear ferrimagnet — Bo-Wen Dong1,2,3, •Andrew Ross1, Joel Cramer1,2, Kathrin Ganzhorn4,5, Huai-Yang Yuan1, Er-Jia Guo1,6, Sebastian T. B. Goennenwein4,5, and Mathias Kläui1,2 — 1Johannes Gutenberg-Universität Mainz, Germany — 2Graduate School of Excellence Materials Science in Mainz (MAINZ), Germany — 3University of Science and Technology Beijing, China — 4Bayerische Akademie der Wissenschaften, Germany — 5Technische Universität München, Germany — 6Oak Ridge National Laboratory, TN, USA
The spin Hall magnetoresistance (SMR) of a gadolinium iron garnet (GdIG)/platinum (Pt) heterostructure was investigated by angular dependent measurements around the compensation temperature of the ferrimagnet, GdIG. Around this temperature, GdIG exhibits a non-collinear magnetic structure, which displays an atypical SMR signal[1]. Far from this temperature, the GdIG is collinear and the resistance displays the usual sin2γ dependence[2]. However, as the temperature is swept around the compensation temperature, the angular dependence becomes more complex with the development of additional peaks that grow until the SMR signal inverts before being suppressed, returning to the typical signal of a collinear ferrimagnet. The number and strength of the peaks appearing in the signal depend on both the temperature and the strength of the applied field. Our results demonstrate the limitations of the current SMR formalism, developed for collinear magnetic structures [1][2]. [1] Ganzhorn et al, Phys. Rev. B 94, 094401(2016), [2] Nakayama et al, Phys. Rev. Lett 110, 206601(2013)