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

doi:10.1063/1.3562511

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

ENG - Electronic Engineering

Research output: Contribution to journal › Article › peer-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-AlO_x 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 language	English
Article number	07C727
Journal	Journal of Applied Physics
Volume	109
Issue number	7
DOIs	https://doi.org/10.1063/1.3562511
Publication status	Published - 2011 Apr 1

ASJC Scopus subject areas

Physics and Astronomy(all)

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10.1063/1.3562511

Cite this

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title = "Spin-transfer torque driven ferromagnetic resonance in nano-contact magnetoresistive devices and its characteristics",

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.",

author = "Yoshihito Okutomi and Kousaku Miyake and Masaaki Doi and Fuke, {Hiromi Niu} and Hitoshi Iwasaki and Masashi Sahashi",

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T1 - Spin-transfer torque driven ferromagnetic resonance in nano-contact magnetoresistive devices and its characteristics

AU - Okutomi, Yoshihito

AU - Miyake, Kousaku

AU - Doi, Masaaki

AU - Fuke, Hiromi Niu

AU - Iwasaki, Hitoshi

AU - Sahashi, Masashi

N1 - Funding Information: This work was partially supported by a NEDO Grant.

PY - 2011/4/1

Y1 - 2011/4/1

N2 - 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.

AB - 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.

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JF - Journal of Applied Physics

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ER -

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

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