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Static magnetic proximity effects and spin Hall magnetoresistance in Pt/Y3Fe5O12 and inverted Y3Fe5O12/Pt bilayers

DOI: 10.1103/PhysRevB.102.214438 DOI Help

Authors: Stephan Geprags (Walther-Meißner-Institut) , Christoph Klewe (Advanced Light Source) , Sibylle Meyer (Walther-Meißner-Institut) , Dominik Graulich (Bielefeld University) , Felix Schade (Walther-Meißner-Institut) , Marc Schneider (Walther-Meißner-Institut) , Sonia Francoual (Deutsches Elektronen-Synchrotron DESY) , Stephen P. Collins (Diamond Light Source) , Katharina Ollefs (European Synchrotron Radiation Facility (ESRF)) , Fabrice Wilhelm (European Synchrotron Radiation Facility (ESRF)) , Andrei Rogalev (European Synchrotron Radiation Facility (ESRF)) , Yves Joly (University Grenoble Alpes, CNRS, Grenoble INP, Institut Néel) , Sebastian T. B. Goennenwein (Technische Universität Dresden) , Matthias Opel (Walther-Meißner-Institut) , Timo Kuschel (University of Bielefeld) , Rudolf Gross (Walther-Meißner-Institut; Technische Universität München; Munich Center for Quantum Science and Technology (MCQST))
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review B , VOL 102

State: Published (Approved)
Published: December 2020
Diamond Proposal Number(s): 12772

Abstract: The magnetic state of heavy metal Pt thin films in proximity to the ferrimagnetic insulator Y 3 Fe 5 O 12 has been investigated systematically by means of x-ray magnetic circular dichroism and x-ray resonant magnetic reflectivity measurements combined with angle-dependent magnetotransport studies. To reveal intermixing effects as the possible cause for induced magnetic moments in Pt, we compare thin film heterostructures with different orders of the layer stacking and different interface properties. For standard Pt layers on Y 3 Fe 5 O 12 thin films, we do not detect any static magnetic polarization in Pt. These samples show an angle-dependent magnetoresistance behavior, which is consistent with the established spin Hall magnetoresistance. In contrast, for the inverted layer sequence, Y 3 Fe 5 O 12 thin films grown on Pt layers, Pt displays a finite induced magnetic moment comparable to that of all-metallic Pt/Fe bilayers. This magnetic moment is found to originate from finite intermixing at the Y 3 Fe 5 O 12 / Pt interface. As a consequence, we found a complex angle-dependent magnetoresistance indicating a superposition of the spin Hall and the anisotropic magnetoresistance in these types of samples. Both effects can be disentangled from each other due to their different angle dependence and their characteristic temperature evolution.

Journal Keywords: Anisotropic magnetoresistance; Inverse spin Hall effect; Magnetoresistance; Spin Hall effect; Spin Hall magnetoresistance; Spin current; X-ray magnetic circular dichroism; X-ray resonant magnetic scattering

Subject Areas: Materials, Physics

Instruments: I16-Materials and Magnetism

Other Facilities: P09 at PETRA III, DESY

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