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, Eiji Saitoh

Research output: Contribution to journalArticlepeer-review

129 Citations (Scopus)


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.

Original languageEnglish
Article number12670
JournalNature communications
Publication statusPublished - 2016 Aug 30

ASJC Scopus subject areas

  • Chemistry(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Physics and Astronomy(all)


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