Electron holography study of remanence states in exchange-biased MnPd/Fe bilayers grown epitaxially on MgO(001)

Jong Seok Jeong; Zentaro Akase; Daisuke Shindo; Qing Feng Zhan; Kannan M. Krishnan

doi:10.1093/jmicro/dfr015

Electron holography study of remanence states in exchange-biased MnPd/Fe bilayers grown epitaxially on MgO(001)

Jong Seok Jeong, Zentaro Akase, Daisuke Shindo, Qing Feng Zhan, Kannan M. Krishnan

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Abstract

We investigated magnetic remanence states of epitaxially grown, exchange-biased MnPd/Fe bilayers by electron holography emphasizing the crystallographic orientations of the layers. Thin-foil transmission electron microscopy (TEM) specimens were carefully prepared along both hard and easy axes of the Fe layer. The ex situ magnetization-reversal process was carried out using the TEM specimens, and magnetic flux densities of the ultra-thin Fe layers were evaluated at different remanence states. We show that a spin configuration in the TEM specimens is determined by the competition between an exchange coupling at the MnPd/Fe bilayer interface, shape anisotropy of TEM specimens and intrinsic magnetocrystalline anisotropy of Fe.

Original language	English
Pages (from-to)	235-242
Number of pages	8
Journal	Journal of Electron Microscopy
Volume	60
Issue number	3
DOIs	https://doi.org/10.1093/jmicro/dfr015
Publication status	Published - 2011 Jun

Keywords

TEM
demagnetizing effects
electron holography
exchange bias
magnetic flux density
shape anisotropy

ASJC Scopus subject areas

Instrumentation

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10.1093/jmicro/dfr015

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@article{e2e2b3b37dba49a4bcc6396f790d2ce9,

title = "Electron holography study of remanence states in exchange-biased MnPd/Fe bilayers grown epitaxially on MgO(001)",

abstract = "We investigated magnetic remanence states of epitaxially grown, exchange-biased MnPd/Fe bilayers by electron holography emphasizing the crystallographic orientations of the layers. Thin-foil transmission electron microscopy (TEM) specimens were carefully prepared along both hard and easy axes of the Fe layer. The ex situ magnetization-reversal process was carried out using the TEM specimens, and magnetic flux densities of the ultra-thin Fe layers were evaluated at different remanence states. We show that a spin configuration in the TEM specimens is determined by the competition between an exchange coupling at the MnPd/Fe bilayer interface, shape anisotropy of TEM specimens and intrinsic magnetocrystalline anisotropy of Fe.",

keywords = "TEM, demagnetizing effects, electron holography, exchange bias, magnetic flux density, shape anisotropy",

author = "Jeong, {Jong Seok} and Zentaro Akase and Daisuke Shindo and Zhan, {Qing Feng} and Krishnan, {Kannan M.}",

note = "Funding Information: This work was supported by the Global COE Program {\textquoteleft}Materials Integration (International Center of Education and Research), Tohoku University{\textquoteright}, MEXT, Japan, and the work at the University of Washington was supported by the US Department of Energy, Basic Energy Sciences, under contract #ER45987.",

year = "2011",

month = jun,

doi = "10.1093/jmicro/dfr015",

language = "English",

volume = "60",

pages = "235--242",

journal = "Microscopy (Oxford, England)",

issn = "2050-5698",

publisher = "Japanese Society of Microscopy",

number = "3",

}

TY - JOUR

T1 - Electron holography study of remanence states in exchange-biased MnPd/Fe bilayers grown epitaxially on MgO(001)

AU - Jeong, Jong Seok

AU - Akase, Zentaro

AU - Shindo, Daisuke

AU - Zhan, Qing Feng

AU - Krishnan, Kannan M.

N1 - Funding Information: This work was supported by the Global COE Program ‘Materials Integration (International Center of Education and Research), Tohoku University’, MEXT, Japan, and the work at the University of Washington was supported by the US Department of Energy, Basic Energy Sciences, under contract #ER45987.

PY - 2011/6

Y1 - 2011/6

N2 - We investigated magnetic remanence states of epitaxially grown, exchange-biased MnPd/Fe bilayers by electron holography emphasizing the crystallographic orientations of the layers. Thin-foil transmission electron microscopy (TEM) specimens were carefully prepared along both hard and easy axes of the Fe layer. The ex situ magnetization-reversal process was carried out using the TEM specimens, and magnetic flux densities of the ultra-thin Fe layers were evaluated at different remanence states. We show that a spin configuration in the TEM specimens is determined by the competition between an exchange coupling at the MnPd/Fe bilayer interface, shape anisotropy of TEM specimens and intrinsic magnetocrystalline anisotropy of Fe.

AB - We investigated magnetic remanence states of epitaxially grown, exchange-biased MnPd/Fe bilayers by electron holography emphasizing the crystallographic orientations of the layers. Thin-foil transmission electron microscopy (TEM) specimens were carefully prepared along both hard and easy axes of the Fe layer. The ex situ magnetization-reversal process was carried out using the TEM specimens, and magnetic flux densities of the ultra-thin Fe layers were evaluated at different remanence states. We show that a spin configuration in the TEM specimens is determined by the competition between an exchange coupling at the MnPd/Fe bilayer interface, shape anisotropy of TEM specimens and intrinsic magnetocrystalline anisotropy of Fe.

KW - TEM

KW - demagnetizing effects

KW - electron holography

KW - exchange bias

KW - magnetic flux density

KW - shape anisotropy

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U2 - 10.1093/jmicro/dfr015

DO - 10.1093/jmicro/dfr015

M3 - Article

C2 - 21474493

AN - SCOPUS:79958858353

VL - 60

SP - 235

EP - 242

JO - Microscopy (Oxford, England)

JF - Microscopy (Oxford, England)

SN - 2050-5698

IS - 3

ER -

Electron holography study of remanence states in exchange-biased MnPd/Fe bilayers grown epitaxially on MgO(001)

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Keywords

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