Effect of surface roughness and field annealing on interlayer coupling in MnIr-based magnetic tunnel junction

Dong Young Kim; Cheol Gi Kim; Chong Oh Kim; M. Tsunoda; M. Takahashi

doi:10.1016/j.jmmm.2006.01.128

Effect of surface roughness and field annealing on interlayer coupling in MnIr-based magnetic tunnel junction

Dong Young Kim, Cheol Gi Kim, Chong Oh Kim, M. Tsunoda, M. Takahashi

Department of Physics and Chemistry

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

2 Scopus citations

Abstract

The interlayer coupling field (H_in) and coercivity (H_c) were measured using micro-optical Kerr effect, and the surface roughness was obtained by using atomic force microscopy (AFM) at different points across the patterned tunnel junction. H_in and H_c increase with greater surface roughness. This result shows that the enhanced coercivity (H_ce) is linearly proportional to H_in such as H_ce = α H_{i n}. Finally, the propositional constant α has been deduced from the annealing field dependence of H_in and H_ce as the function of surface magnetization of pinned layer, α = ( M_s - M_ps ) / M_ps. From the results of H_in and H_ce in magnetic tunnel junction (MTJ) multilayer, we can infer that the surface magnetization of pinned layer is due to the interfacial morphological corrugations.

Original language	English
Pages (from-to)	e267-e269
Journal	Journal of Magnetism and Magnetic Materials
Volume	304
Issue number	1
DOIs	https://doi.org/10.1016/j.jmmm.2006.01.128
State	Published - Sep 2006

Bibliographical note

Funding Information:
This work was supported by the KOSEF through ReCAMM in Chungnam National University.

Keywords

Enhanced coercivity
Interlayer coupling
Magnetic tunnel junction
Roughness

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10.1016/j.jmmm.2006.01.128

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title = "Effect of surface roughness and field annealing on interlayer coupling in MnIr-based magnetic tunnel junction",

abstract = "The interlayer coupling field (Hin) and coercivity (Hc) were measured using micro-optical Kerr effect, and the surface roughness was obtained by using atomic force microscopy (AFM) at different points across the patterned tunnel junction. Hin and Hc increase with greater surface roughness. This result shows that the enhanced coercivity (Hce) is linearly proportional to Hin such as Hce = α Hi n. Finally, the propositional constant α has been deduced from the annealing field dependence of Hin and Hce as the function of surface magnetization of pinned layer, α = ( Ms - Mps ) / Mps. From the results of Hin and Hce in magnetic tunnel junction (MTJ) multilayer, we can infer that the surface magnetization of pinned layer is due to the interfacial morphological corrugations.",

keywords = "Enhanced coercivity, Interlayer coupling, Magnetic tunnel junction, Roughness",

author = "Kim, \{Dong Young\} and Kim, \{Cheol Gi\} and Kim, \{Chong Oh\} and M. Tsunoda and M. Takahashi",

note = "Funding Information: This work was supported by the KOSEF through ReCAMM in Chungnam National University.",

year = "2006",

month = sep,

doi = "10.1016/j.jmmm.2006.01.128",

language = "English",

volume = "304",

pages = "e267--e269",

journal = "Journal of Magnetism and Magnetic Materials",

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TY - JOUR

T1 - Effect of surface roughness and field annealing on interlayer coupling in MnIr-based magnetic tunnel junction

AU - Kim, Dong Young

AU - Kim, Cheol Gi

AU - Kim, Chong Oh

AU - Tsunoda, M.

AU - Takahashi, M.

N1 - Funding Information: This work was supported by the KOSEF through ReCAMM in Chungnam National University.

PY - 2006/9

Y1 - 2006/9

N2 - The interlayer coupling field (Hin) and coercivity (Hc) were measured using micro-optical Kerr effect, and the surface roughness was obtained by using atomic force microscopy (AFM) at different points across the patterned tunnel junction. Hin and Hc increase with greater surface roughness. This result shows that the enhanced coercivity (Hce) is linearly proportional to Hin such as Hce = α Hi n. Finally, the propositional constant α has been deduced from the annealing field dependence of Hin and Hce as the function of surface magnetization of pinned layer, α = ( Ms - Mps ) / Mps. From the results of Hin and Hce in magnetic tunnel junction (MTJ) multilayer, we can infer that the surface magnetization of pinned layer is due to the interfacial morphological corrugations.

AB - The interlayer coupling field (Hin) and coercivity (Hc) were measured using micro-optical Kerr effect, and the surface roughness was obtained by using atomic force microscopy (AFM) at different points across the patterned tunnel junction. Hin and Hc increase with greater surface roughness. This result shows that the enhanced coercivity (Hce) is linearly proportional to Hin such as Hce = α Hi n. Finally, the propositional constant α has been deduced from the annealing field dependence of Hin and Hce as the function of surface magnetization of pinned layer, α = ( Ms - Mps ) / Mps. From the results of Hin and Hce in magnetic tunnel junction (MTJ) multilayer, we can infer that the surface magnetization of pinned layer is due to the interfacial morphological corrugations.

KW - Enhanced coercivity

KW - Interlayer coupling

KW - Magnetic tunnel junction

KW - Roughness

UR - https://www.scopus.com/pages/publications/33646887361

U2 - 10.1016/j.jmmm.2006.01.128

DO - 10.1016/j.jmmm.2006.01.128

M3 - Article

AN - SCOPUS:33646887361

SN - 0304-8853

VL - 304

SP - e267-e269

JO - Journal of Magnetism and Magnetic Materials

JF - Journal of Magnetism and Magnetic Materials

IS - 1

ER -

Effect of surface roughness and field annealing on interlayer coupling in MnIr-based magnetic tunnel junction

Abstract

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Keywords

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