Spin-transfer torque driven ferromagnetic resonance in nano-contact magnetoresistive devices and its characteristics

Yoshihito Okutomi, Kousaku Miyake, Masaaki Doi, Hiromi Niu Fuke, Hitoshi Iwasaki, Masashi Sahashi

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

We investigated the spin-transfer torque driven ferromagnetic resonance in nano-contact magnetoresistive (NCMR) devices with a current-perpendicular-to- plane spin-valve structure consisting of a FeCo layer, a FeCo-AlOx nano-oxide layer, a FeCo multilayer for the reference, a spacer, and free layers. In contrast with tunneling magnetoresistance devices with an AlO x spacer layer that shows a single resonant frequency, NCMR devices showed multi-resonant frequencies caused by free-layer resonance and other types of resonance appeared in a frequency region higher than that of the free-layer. We discuss these characteristic results in terms of the magnetic structure of the NCMR device, especially the free and reference layers around the nano-contacts.

Original languageEnglish
Article number07C727
JournalJournal of Applied Physics
Volume109
Issue number7
DOIs
Publication statusPublished - 2011 Apr 1

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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