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SUMMARY:Spin Hall Magnetoresistance at the Altermagnetic Insulator/Pt Inte
 rface
DTSTART:20260521T080000Z
DTEND:20260521T090000Z
DTSTAMP:20260512T174700Z
UID:indico-event-18775@indico.psi.ch
CONTACT:alberto.carta@psi.ch
DESCRIPTION:Speakers: Miina Leiviskä (Czech Academy of Sciences (FZU))\n\
 nM. Leiviskä1\, R. Firouzmandi2\, K. Ahn1\, P. Kubaščik3\, Z. Soban1\, 
 S. Bommanaboyena1\, C. Müller1\, D. Kriegner1\, D. Reustlen4\, S. Sailler
 4\, M. Lammel4\, K. Bestha2\,5\, M. Hyvl1\, L. Šmejkal6\,7\,1\, J. Zelezn
 y1\, A. U. B. Wolter2\, M. Scheufele8\,9\, J. Fischer10\, M. Opel8\, S. Ge
 prägs8\, M. Althammer8\,  B. Büchner2\,11\,12\, T. Jungwirth1\,13\, L. 
 Nádvorník3\, S. T. B. Goennenwein4\, V. Kocsis2\, and H. Reichlova1\n1In
 stitute of Physics\, Czech Academy of Sciences\, Czechia\n2Institut für F
 estkörperforschung\, Leibniz IFW Dresden\, Germany\n3Faculty of Mathemati
 cs and Physics\, Charles University\, Czechia\n4Department of Physics\, Un
 iversity of Konstanz\, Germany\n5Institute of Solid State and Materials Ph
 ysics\, TU Dresden\, Germany\n6Max Planck Institute for the Physics of Com
 plex Systems\, Germany\n7Max Planck Institute for Chemical Physics of Soli
 ds\, Germany\n8Walther-Meißner-Institut\, Bayerische Akademie der Wissens
 chaften\, Germany\n9Technical University of Munich\, TUM School of Natural
  Sciences\, Germany\n10Universite Grenoble Alpes\, CEA\, CNRS\, Spintec\, 
 France\n11Institute of Solid State and Materials Physics and Würzburg-Dre
 sden Cluster of Excellence ct.qmat\, Technische Universität Dresden\, Ger
 many\n12Center for Transport and Devices\, Technische Universität Dresden
 \, Germany\n13School of Physics and Astronomy\, University of Nottingham\,
  UK\n \nSpin Hall magnetoresistance (SMR) is a magnetoresistive effect pr
 esent in bilayers comprising of a magnet (here insulating) and a heavy met
 al [1]. It relies on the concerted action of spin Hall effect\, inverse sp
 in Hall effect\, and dissipation of spin accumulation at the interface. Th
 e dissipation of the spin accumulation occurs via various channels\, inclu
 ding spin-transfer torque and magnon-mediated spin current transfer. Alter
 magnets are a new class of collinear compensated magnets with a unique ani
 sotropic spin ordering with characteristic spin-degenerate nodes and alter
 nating even-parity spin polarization that breaks the time-reversal symmetr
 y [2]. In this work\, we present a set of SMR measurements in heterostruct
 ures of Pt and an insulating and ferroelectric altermagnet candidates Ba2C
 oGe2O7 [3] and Sr2CoSi2O7. We will first detail the fabrication of devices
  for SMR experiments on bulk crystals and then discuss characteristic SMR 
 features of the systems under study. We show that in both systems the SMR 
 ratio is unexpectedly large and shows anisotropy depending on in which cry
 stal direction the current is applied. We systematically rule out device-t
 o-device variations\, magnetic domains\, and magnetocrystalline anisotropy
  as the main origin of this current-direction anisotropy of the SMR ratio\
 , and also address the possible effects of ferroelectric polarization on t
 he SMR. Finally\, we will suggest mechanisms through which the crystal sym
 metries that characterize the altermagnetic phase of Ba2CoGe2O7 and Sr2CoS
 i2O7 could give rise to the observed anisotropy.\n \nReferences\n[1] H. N
 akayama\, M. Althammer\, Y.-T. Chen\, et al. Phys. Rev. Lett. 110\, 206601
  (2013).\n[2] L. Šmejkal\, J. Sinova\, and T. Jungwirth. Phys. Rev. X 12\
 , 031042 (2022).\n[3] M. Leiviskä\, R. Firouzmandi\, K. Ahn et al. Phys. 
 Rev. Mat. 9\, 084403 (2025)\n\nhttps://indico.psi.ch/event/18775/
LOCATION:OVGA/200
URL:https://indico.psi.ch/event/18775/
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