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Imaging Magnetization Structure and Dynamics in Ultrathin Y3Fe5O12/Pt Bilayers with High Sensitivity Using the Time-Resolved Longitudinal Spin Seebeck Effect

Jason M. Bartell1, Colin L. Jermain1, Sriharsha V. Aradhya1, Jack T. Brangham2, Fengyuan Yang2, Daniel C. Ralph1,3, and Gregory D. Fuchs1

  • 1Cornell University, Ithaca, New York 14853, USA
  • 2Department of Physics, The Ohio State University, Columbus, Ohio 43016, USA
  • 3Kavli Institute at Cornell for Nanoscale Science, Ithaca, New York 14853, USA

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Phys. Rev. Applied 7, 044004 – Published 6 April, 2017

DOI: https://doi.org/10.1103/PhysRevApplied.7.044004

Abstract

We demonstrate an instrument for time-resolved magnetic imaging that is highly sensitive to the in-plane magnetization state and dynamics of thin-film bilayers of yttrium iron garnet [Y3Fe5O12(YIG)]/Pt: the time-resolved longitudinal spin Seebeck (TRLSSE) effect microscope. We detect the local in-plane magnetic orientation within the YIG by focusing a picosecond laser to generate thermally driven spin current from the YIG into the Pt by the spin Seebeck effect and then use the inverse spin Hall effect in the Pt to transduce this spin current to an output voltage. To establish the time resolution of TRLSSE, we show that pulsed optical heating of patterned YIG (20  nm)/Pt(6  nm)/Ru(2  nm) wires generates a magnetization-dependent voltage pulse of less than 100 ps. We demonstrate TRLSSE microscopy to image both static magnetic structure and gigahertz-frequency magnetic resonance dynamics with submicron spatial resolution and a sensitivity to magnetic orientation below 0.3°/Hz in ultrathin YIG.

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Phys. Rev. Applied 7, 044004– Published 6 April, 2017
  • Received 17 January 2017
Article part of CHORUS

© 2017 American Physical Society

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