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Magnetization switching using topological surface states.
Li, Peng; Kally, James; Zhang, Steven S-L; Pillsbury, Timothy; Ding, Jinjun; Csaba, Gyorgy; Ding, Junjia; Jiang, J S; Liu, Yunzhi; Sinclair, Robert; Bi, Chong; DeMann, August; Rimal, Gaurab; Zhang, Wei; Field, Stuart B; Tang, Jinke; Wang, Weigang; Heinonen, Olle G; Novosad, Valentine; Hoffmann, Axel; Samarth, Nitin; Wu, Mingzhong.
Afiliación
  • Li P; Department of Physics, Colorado State University, Fort Collins, CO 80523, USA.
  • Kally J; Department of Physics, Pennsylvania State University, University Park, PA 16802, USA.
  • Zhang SS; Materials Science Division, Argonne National Laboratory, Lemont, IL 60439, USA.
  • Pillsbury T; Department of Physics, Pennsylvania State University, University Park, PA 16802, USA.
  • Ding J; Department of Physics, Colorado State University, Fort Collins, CO 80523, USA.
  • Csaba G; Faculty of Information Technology and Bionics, Pazmany Peter Catholic University, Budapest, Hungary.
  • Ding J; Materials Science Division, Argonne National Laboratory, Lemont, IL 60439, USA.
  • Jiang JS; Materials Science Division, Argonne National Laboratory, Lemont, IL 60439, USA.
  • Liu Y; Department of Materials Science and Engineering, Stanford University, Stanford, CA 94305, USA.
  • Sinclair R; Department of Materials Science and Engineering, Stanford University, Stanford, CA 94305, USA.
  • Bi C; Department of Physics, University of Arizona, Tucson, AZ 85721, USA.
  • DeMann A; Department of Physics, Colorado State University, Fort Collins, CO 80523, USA.
  • Rimal G; Department of Physics and Astronomy, University of Wyoming, Laramie, WY 82071, USA.
  • Zhang W; Department of Physics, Oakland University, Rochester, MI 48309, USA.
  • Field SB; Materials Science Division, Argonne National Laboratory, Lemont, IL 60439, USA.
  • Tang J; Department of Physics, Colorado State University, Fort Collins, CO 80523, USA.
  • Wang W; Department of Physics and Astronomy, University of Wyoming, Laramie, WY 82071, USA.
  • Heinonen OG; Department of Physics, University of Arizona, Tucson, AZ 85721, USA.
  • Novosad V; Materials Science Division, Argonne National Laboratory, Lemont, IL 60439, USA.
  • Hoffmann A; Materials Science Division, Argonne National Laboratory, Lemont, IL 60439, USA.
  • Samarth N; Materials Science Division, Argonne National Laboratory, Lemont, IL 60439, USA.
  • Wu M; Department of Physics, Pennsylvania State University, University Park, PA 16802, USA.
Sci Adv ; 5(8): eaaw3415, 2019 Aug.
Article en En | MEDLINE | ID: mdl-31497642
ABSTRACT
Topological surface states (TSSs) in a topological insulator are expected to be able to produce a spin-orbit torque that can switch a neighboring ferromagnet. This effect may be absent if the ferromagnet is conductive because it can completely suppress the TSSs, but it should be present if the ferromagnet is insulating. This study reports TSS-induced switching in a bilayer consisting of a topological insulator Bi2Se3 and an insulating ferromagnet BaFe12O19. A charge current in Bi2Se3 can switch the magnetization in BaFe12O19 up and down. When the magnetization is switched by a field, a current in Bi2Se3 can reduce the switching field by ~4000 Oe. The switching efficiency at 3 K is 300 times higher than at room temperature; it is ~30 times higher than in Pt/BaFe12O19. These strong effects originate from the presence of more pronounced TSSs at low temperatures due to enhanced surface conductivity and reduced bulk conductivity.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Sci Adv Año: 2019 Tipo del documento: Article País de afiliación: Estados Unidos
Texto completo
Añadir a Mi BVS
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XML
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Sci Adv Año: 2019 Tipo del documento: Article País de afiliación: Estados Unidos