All-optical detection of magnetization precession in tunnel junctions under applied voltage

Yuta Sasaki, Kazuya Suzuki, Atsushi Sugihara, Akira Kamimaki, Satoshi Iihama, Yasuo Ando, Shigemi Mizukami

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

An all-optical time-resolved magneto-optical Kerr effect measurement of a micron-sized tunnel junction with a CoFeB electrode was performed. The femtosecond (fs) laser-induced magnetization precession was clearly observed at various magnetic field angles. The frequency f and relaxation time τ of the magnetization precession varied with the voltage applied via a MgO barrier. The precession dynamics were in accordance with Kittel's ferromagnetic resonance mode, and the voltage-induced changes in f and τ were well explained by the voltage-induced change in the perpendicular magnetic anisotropy of %36 fJ/Vm.

Original languageEnglish
Article number023002
JournalApplied Physics Express
Volume10
Issue number2
DOIs
Publication statusPublished - 2017 Feb

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

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