Spin-current probe for phase transition in an insulator

Zhiyong Qiu, Jia Li, Dazhi Hou (), Elke Arenholz, Alpha T. N’Diaye, Ali Tan, Ken-ichi Uchida, Koji Sato, Satoshi Okamoto, Yaroslav Tserkovnyak, Z. Q. Qiu and Eiji Saitoh
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Zhiyong Qiu: WPI Advanced Institute for Materials Research, Tohoku University
Jia Li: University of California at Berkeley
Dazhi Hou: WPI Advanced Institute for Materials Research, Tohoku University
Elke Arenholz: Advanced Light Source, Lawrence Berkeley National Laboratory
Alpha T. N’Diaye: Advanced Light Source, Lawrence Berkeley National Laboratory
Ali Tan: University of California at Berkeley
Ken-ichi Uchida: Institute for Materials Research, Tohoku University
Koji Sato: WPI Advanced Institute for Materials Research, Tohoku University
Satoshi Okamoto: Oak Ridge National Laboratory
Yaroslav Tserkovnyak: University of California
Z. Q. Qiu: University of California at Berkeley
Eiji Saitoh: WPI Advanced Institute for Materials Research, Tohoku University

Nature Communications, 2016, vol. 7, issue 1, 1-6

Abstract: Abstract Spin fluctuation and transition have always been one of the central topics of magnetism and condensed matter science. Experimentally, the spin fluctuation is found transcribed onto scattering intensity in the neutron-scattering process, which is represented by dynamical magnetic susceptibility and maximized at phase transitions. Importantly, a neutron carries spin without electric charge, and therefore it can bring spin into a sample without being disturbed by electric energy. However, large facilities such as a nuclear reactor are necessary. Here we show that spin pumping, frequently used in nanoscale spintronic devices, provides a desktop microprobe for spin transition; spin current is a flux of spin without an electric charge and its transport reflects spin excitation. We demonstrate detection of antiferromagnetic transition in ultra-thin CoO films via frequency-dependent spin-current transmission measurements, which provides a versatile probe for phase transition in an electric manner in minute devices.

Date: 2016
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DOI: 10.1038/ncomms12670

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