Linear frequency modulation by weak bipolar magnetic fields for a vortex-mode oscillation in a nanocontact magnetoresistive spin-torque-oscillator

Kosaku Miyake; Yoshihito Okutomi; Hiroshi Tsukahara; Hiroshi Imamura; Masashi Sahashi

doi:10.7567/APEX.6.113001

Linear frequency modulation by weak bipolar magnetic fields for a vortex-mode oscillation in a nanocontact magnetoresistive spin-torque-oscillator

Kosaku Miyake, Yoshihito Okutomi, Hiroshi Tsukahara, Hiroshi Imamura, Masashi Sahashi

ENG - Electronic Engineering

Research output: Contribution to journal › Article › peer-review

5 Citations (Scopus)

Abstract

Spin torque oscillations near zero magnetic fields were investigated in a nanocontact magnetoresistive device. A typical auto-oscillation mode was observed with high amplitude and narrow linewidth in a vortex domain state of the free layer around the zero field. The number of branches was reduced to a single one with an increase of current over the threshold value. As a result, we observed a linear frequency change between a wider field range across zero fields with a high amplitude and a narrow linewidth for the oscillation. The frequency response to small bipolar applied fields is applicable to a weak-field sensor.

Original language	English
Article number	113001
Journal	Applied Physics Express
Volume	6
Issue number	11
DOIs	https://doi.org/10.7567/APEX.6.113001
Publication status	Published - 2013 Nov 1

ASJC Scopus subject areas

Engineering(all)
Physics and Astronomy(all)

Access to Document

10.7567/APEX.6.113001

Fingerprint Dive into the research topics of 'Linear frequency modulation by weak bipolar magnetic fields for a vortex-mode oscillation in a nanocontact magnetoresistive spin-torque-oscillator'. Together they form a unique fingerprint.

Cite this

Linear frequency modulation by weak bipolar magnetic fields for a vortex-mode oscillation in a nanocontact magnetoresistive spin-torque-oscillator. / Miyake, Kosaku; Okutomi, Yoshihito; Tsukahara, Hiroshi; Imamura, Hiroshi; Sahashi, Masashi.

In: Applied Physics Express, Vol. 6, No. 11, 113001, 01.11.2013.

Research output: Contribution to journal › Article › peer-review

@article{3d9791859700460c823d0c45c66a73cd,

title = "Linear frequency modulation by weak bipolar magnetic fields for a vortex-mode oscillation in a nanocontact magnetoresistive spin-torque-oscillator",

abstract = "Spin torque oscillations near zero magnetic fields were investigated in a nanocontact magnetoresistive device. A typical auto-oscillation mode was observed with high amplitude and narrow linewidth in a vortex domain state of the free layer around the zero field. The number of branches was reduced to a single one with an increase of current over the threshold value. As a result, we observed a linear frequency change between a wider field range across zero fields with a high amplitude and a narrow linewidth for the oscillation. The frequency response to small bipolar applied fields is applicable to a weak-field sensor.",

author = "Kosaku Miyake and Yoshihito Okutomi and Hiroshi Tsukahara and Hiroshi Imamura and Masashi Sahashi",

year = "2013",

month = nov,

day = "1",

doi = "10.7567/APEX.6.113001",

language = "English",

volume = "6",

journal = "Applied Physics Express",

issn = "1882-0778",

publisher = "Japan Society of Applied Physics",

number = "11",

}

TY - JOUR

T1 - Linear frequency modulation by weak bipolar magnetic fields for a vortex-mode oscillation in a nanocontact magnetoresistive spin-torque-oscillator

AU - Miyake, Kosaku

AU - Okutomi, Yoshihito

AU - Tsukahara, Hiroshi

AU - Imamura, Hiroshi

AU - Sahashi, Masashi

PY - 2013/11/1

Y1 - 2013/11/1

N2 - Spin torque oscillations near zero magnetic fields were investigated in a nanocontact magnetoresistive device. A typical auto-oscillation mode was observed with high amplitude and narrow linewidth in a vortex domain state of the free layer around the zero field. The number of branches was reduced to a single one with an increase of current over the threshold value. As a result, we observed a linear frequency change between a wider field range across zero fields with a high amplitude and a narrow linewidth for the oscillation. The frequency response to small bipolar applied fields is applicable to a weak-field sensor.

AB - Spin torque oscillations near zero magnetic fields were investigated in a nanocontact magnetoresistive device. A typical auto-oscillation mode was observed with high amplitude and narrow linewidth in a vortex domain state of the free layer around the zero field. The number of branches was reduced to a single one with an increase of current over the threshold value. As a result, we observed a linear frequency change between a wider field range across zero fields with a high amplitude and a narrow linewidth for the oscillation. The frequency response to small bipolar applied fields is applicable to a weak-field sensor.

UR - http://www.scopus.com/inward/record.url?scp=84887769224&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84887769224&partnerID=8YFLogxK

U2 - 10.7567/APEX.6.113001

DO - 10.7567/APEX.6.113001

M3 - Article

AN - SCOPUS:84887769224

VL - 6

JO - Applied Physics Express

JF - Applied Physics Express

SN - 1882-0778

IS - 11

M1 - 113001

ER -

Linear frequency modulation by weak bipolar magnetic fields for a vortex-mode oscillation in a nanocontact magnetoresistive spin-torque-oscillator

Abstract

ASJC Scopus subject areas

Access to Document

Other files and links

Cite this