Spin Hall magnetoresistance in a canted ferrimagnet

Kathrin Ganzhorn (1, 2) , Joseph Barker (3) , Richard Schlitz (1, 2) , Benjamin Piot (4) , Katharina Ollefs (5, 6) , Francois Guillou (7, 5) , Fabrice Wilhelm (5) , Andrei Rogalev (5) , Matthias Opel (1) , Matthias Althammer (1, 2) , Stephan Geprägs (1) , Hans Huebl (1, 2, 8) , Rudolf Gross (1, 2, 8) , Gerrit Bauer (3, 9, 10) , Sebastian Goennenwein (1, 2, 8)

1 BADW - Bayerische Akademie der Wissenschaften
2 TUM - Technische Universität Munchen - Technical University Munich - Université Technique de Munich
3 Tohoku University [Sendai]
4 LNCMI-G - Laboratoire national des champs magnétiques intenses - Grenoble
5 ESRF - European Synchrotron Radiation Facility
6 Uniklinik Essen - Universitätsklinikum Essen [Universität Duisburg-Essen]
7 CRISMAT - Laboratoire de cristallographie et sciences des matériaux
8 DFG - Deutsche Forschungsgemeinschaft - German Research Foundation
9 TU Delft - Delft University of Technology
10 WPI-AIMR - WPI Advanced Institute for Materials Research

We study the spin Hall magnetoresistance effect in ferrimagnet/normal metal bilayers, comparing the response in collinear and canted magnetic phases. In the collinear magnetic phase, in which the sublattice magnetic moments are all aligned along the same axis, we observe the conventional spin Hall magnetoresistance. In contrast, in the canted phase, the magnetoresistance changes sign. Using atomistic spin simulations and x-ray absorption experiments, we can understand these observations in terms of the magnetic field and temperature dependent orientation of magnetic moments on different magnetic sublattices. This enables a magnetotransport based investigation of noncollinear magnetic textures.

Mots clés: Bilayers; Spin Hall magnetoresistance; Ferrimagnets; Magnetic insulators; Noncollinear magnets; Hall bar; Molecular dynamics

Domaines: Science des matériaux [cond-mat.mtrl-sci]; Systèmes mésoscopiques et effet Hall quantique [cond-mat.mes-hall]; Autre [cond-mat.other]

Kathrin Ganzhorn, Joseph Barker, Richard Schlitz, Benjamin Piot, Katharina Ollefs, et al.. Spin Hall magnetoresistance in a canted ferrimagnet. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2016, 94 (9), pp.094401. ⟨10.1103/PhysRevB.94.094401⟩. ⟨hal-01986063⟩