Magnetic noise spectra and spin transfer torque of a magnetic tunnel junction with an exchange biased synthetic ferrimagnetic reference layer

Chun Yeol You; Jungbum Yoon; Seung Young Park; Shinji Yuasa; Myung Hwa Jung

doi:10.1016/j.cap.2010.11.128

Magnetic noise spectra and spin transfer torque of a magnetic tunnel junction with an exchange biased synthetic ferrimagnetic reference layer

Chun Yeol You, Jungbum Yoon, Seung Young Park, Shinji Yuasa, Myung Hwa Jung

Department of Physics and Chemistry

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

11 Scopus citations

Abstract

We investigate magnetic thermal noise spectra in magnetic tunneling junction with spin transfer torque. The basic structure of the examined magnetic tunneling junction is PtMn/F₃/Ru/F₂/MgO/F₁, where F_1,2,3 are ferromagnetic layers. F₁ acts as a soft free layer, while PtMn/F₃/Ru/F₂, an exchange biased synthetic ferrimagnet structure, serves as a fixed reference layer. With the assumption of rigid fixed reference layer, the magnetic thermal noise is only related with the thermal motion of the free layer spins. However, we find additional resonance peaks in the magnetic noise spectra, which correspond to the thermal motion of the reference layer spins. Furthermore, the magnetic noise spectra show intricate field dependences, which are related with the spin dynamics of the reference layer induced by spin transfer torque.

Original language	English
Pages (from-to)	e92-e94
Journal	Current Applied Physics
Volume	11
Issue number	2 SUPPL.
DOIs	https://doi.org/10.1016/j.cap.2010.11.128
State	Published - Mar 2011

Bibliographical note

Funding Information:
This work was supported by the IT R&D program of MKE/KEIT [ 2009-F-004-01 ], by Nano R&D program (Grant No. 2008-02553 ), and by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology ( KRF-2010-0005427 ).

Keywords

Magnetic noise spectra
Magnetic tunnel junction
Spin transfer torque
Thermal spin dynamics

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10.1016/j.cap.2010.11.128

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@article{af01c3d8e54c4f3da165343e39ffa5b3,

title = "Magnetic noise spectra and spin transfer torque of a magnetic tunnel junction with an exchange biased synthetic ferrimagnetic reference layer",

abstract = "We investigate magnetic thermal noise spectra in magnetic tunneling junction with spin transfer torque. The basic structure of the examined magnetic tunneling junction is PtMn/F3/Ru/F2/MgO/F1, where F1,2,3 are ferromagnetic layers. F1 acts as a soft free layer, while PtMn/F3/Ru/F2, an exchange biased synthetic ferrimagnet structure, serves as a fixed reference layer. With the assumption of rigid fixed reference layer, the magnetic thermal noise is only related with the thermal motion of the free layer spins. However, we find additional resonance peaks in the magnetic noise spectra, which correspond to the thermal motion of the reference layer spins. Furthermore, the magnetic noise spectra show intricate field dependences, which are related with the spin dynamics of the reference layer induced by spin transfer torque.",

keywords = "Magnetic noise spectra, Magnetic tunnel junction, Spin transfer torque, Thermal spin dynamics",

author = "You, {Chun Yeol} and Jungbum Yoon and Park, {Seung Young} and Shinji Yuasa and Jung, {Myung Hwa}",

note = "Funding Information: This work was supported by the IT R&D program of MKE/KEIT [ 2009-F-004-01 ], by Nano R&D program (Grant No. 2008-02553 ), and by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology ( KRF-2010-0005427 ).",

year = "2011",

month = mar,

doi = "10.1016/j.cap.2010.11.128",

language = "English",

volume = "11",

pages = "e92--e94",

journal = "Current Applied Physics",

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publisher = "Elsevier B.V.",

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TY - JOUR

T1 - Magnetic noise spectra and spin transfer torque of a magnetic tunnel junction with an exchange biased synthetic ferrimagnetic reference layer

AU - You, Chun Yeol

AU - Yoon, Jungbum

AU - Park, Seung Young

AU - Yuasa, Shinji

AU - Jung, Myung Hwa

N1 - Funding Information: This work was supported by the IT R&D program of MKE/KEIT [ 2009-F-004-01 ], by Nano R&D program (Grant No. 2008-02553 ), and by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology ( KRF-2010-0005427 ).

PY - 2011/3

Y1 - 2011/3

N2 - We investigate magnetic thermal noise spectra in magnetic tunneling junction with spin transfer torque. The basic structure of the examined magnetic tunneling junction is PtMn/F3/Ru/F2/MgO/F1, where F1,2,3 are ferromagnetic layers. F1 acts as a soft free layer, while PtMn/F3/Ru/F2, an exchange biased synthetic ferrimagnet structure, serves as a fixed reference layer. With the assumption of rigid fixed reference layer, the magnetic thermal noise is only related with the thermal motion of the free layer spins. However, we find additional resonance peaks in the magnetic noise spectra, which correspond to the thermal motion of the reference layer spins. Furthermore, the magnetic noise spectra show intricate field dependences, which are related with the spin dynamics of the reference layer induced by spin transfer torque.

AB - We investigate magnetic thermal noise spectra in magnetic tunneling junction with spin transfer torque. The basic structure of the examined magnetic tunneling junction is PtMn/F3/Ru/F2/MgO/F1, where F1,2,3 are ferromagnetic layers. F1 acts as a soft free layer, while PtMn/F3/Ru/F2, an exchange biased synthetic ferrimagnet structure, serves as a fixed reference layer. With the assumption of rigid fixed reference layer, the magnetic thermal noise is only related with the thermal motion of the free layer spins. However, we find additional resonance peaks in the magnetic noise spectra, which correspond to the thermal motion of the reference layer spins. Furthermore, the magnetic noise spectra show intricate field dependences, which are related with the spin dynamics of the reference layer induced by spin transfer torque.

KW - Magnetic noise spectra

KW - Magnetic tunnel junction

KW - Spin transfer torque

KW - Thermal spin dynamics

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U2 - 10.1016/j.cap.2010.11.128

DO - 10.1016/j.cap.2010.11.128

M3 - Article

AN - SCOPUS:79960918624

SN - 1567-1739

VL - 11

SP - e92-e94

JO - Current Applied Physics

JF - Current Applied Physics

IS - 2 SUPPL.

ER -

Magnetic noise spectra and spin transfer torque of a magnetic tunnel junction with an exchange biased synthetic ferrimagnetic reference layer

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Keywords

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