Negative coercivity characteristics in antiferromagnetic coupled hard/soft multilayers

Dong Young Kim; Cheol Gi Kim; Chong Oh Kim; Seok Soo Yoon; Mamiko Naka; Masakiyo Tsunoda; Migaku Takahashi

doi:10.1016/j.jmmm.2006.01.198

Negative coercivity characteristics in antiferromagnetic coupled hard/soft multilayers

Dong Young Kim, Cheol Gi Kim, Chong Oh Kim, Seok Soo Yoon, Mamiko Naka, Masakiyo Tsunoda, Migaku Takahashi

Research Center for Green X-Tech

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13 Citations (Scopus)

Abstract

We investigated the negative coercivity (H_c) by using the Stoner-Wohlfarth model in antiferromagnetic-coupled hard/soft bilayers. We found out the conditions for negative H_c in terms of thickness (d_H) and anisotropy energy(K_H) of hard layer such as d_H<0.5 and d_HK_H>2J in antiferromagnetic-coupled bilayers. In order to test our predictions experimentally, we prepared a series of synthetic exchange-coupled multilayer structure of MnIr/CoFe/Ru(x)/CoFe/MnIr thin film with x = 0.9, 1.0 and 1.1 nm. The inverted hysteresis loop with negative H_c was observed in antiferromagnetic-coupled multilayers, and not in ferromagnetic-coupled sample. The negative H_c behavior was well agreed with the theoretical predictions.

Original language	English
Pages (from-to)	e356-e358
Journal	Journal of Magnetism and Magnetic Materials
Volume	304
Issue number	1
DOIs	https://doi.org/10.1016/j.jmmm.2006.01.198
Publication status	Published - 2006 Sept

Keywords

Antiferromagnetic coupling
Hard/soft magnet
Negative coercivity

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10.1016/j.jmmm.2006.01.198

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@article{efde105466bb4899892abc3a7f449b3d,

title = "Negative coercivity characteristics in antiferromagnetic coupled hard/soft multilayers",

abstract = "We investigated the negative coercivity (Hc) by using the Stoner-Wohlfarth model in antiferromagnetic-coupled hard/soft bilayers. We found out the conditions for negative Hc in terms of thickness (dH) and anisotropy energy(KH) of hard layer such as dH<0.5 and dHKH>2J in antiferromagnetic-coupled bilayers. In order to test our predictions experimentally, we prepared a series of synthetic exchange-coupled multilayer structure of MnIr/CoFe/Ru(x)/CoFe/MnIr thin film with x = 0.9, 1.0 and 1.1 nm. The inverted hysteresis loop with negative Hc was observed in antiferromagnetic-coupled multilayers, and not in ferromagnetic-coupled sample. The negative Hc behavior was well agreed with the theoretical predictions.",

keywords = "Antiferromagnetic coupling, Hard/soft magnet, Negative coercivity",

author = "Kim, {Dong Young} and Kim, {Cheol Gi} and Kim, {Chong Oh} and Yoon, {Seok Soo} and Mamiko Naka and Masakiyo Tsunoda and Migaku Takahashi",

note = "Funding Information: This work was supported by the Korea Science and Engineering Foundation through the Research Center for Advanced Magnetic Materials in Chungnam National University.",

year = "2006",

month = sep,

doi = "10.1016/j.jmmm.2006.01.198",

language = "English",

volume = "304",

pages = "e356--e358",

journal = "Journal of Magnetism and Magnetic Materials",

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publisher = "Elsevier",

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TY - JOUR

T1 - Negative coercivity characteristics in antiferromagnetic coupled hard/soft multilayers

AU - Kim, Dong Young

AU - Kim, Cheol Gi

AU - Kim, Chong Oh

AU - Yoon, Seok Soo

AU - Naka, Mamiko

AU - Tsunoda, Masakiyo

AU - Takahashi, Migaku

N1 - Funding Information: This work was supported by the Korea Science and Engineering Foundation through the Research Center for Advanced Magnetic Materials in Chungnam National University.

PY - 2006/9

Y1 - 2006/9

N2 - We investigated the negative coercivity (Hc) by using the Stoner-Wohlfarth model in antiferromagnetic-coupled hard/soft bilayers. We found out the conditions for negative Hc in terms of thickness (dH) and anisotropy energy(KH) of hard layer such as dH<0.5 and dHKH>2J in antiferromagnetic-coupled bilayers. In order to test our predictions experimentally, we prepared a series of synthetic exchange-coupled multilayer structure of MnIr/CoFe/Ru(x)/CoFe/MnIr thin film with x = 0.9, 1.0 and 1.1 nm. The inverted hysteresis loop with negative Hc was observed in antiferromagnetic-coupled multilayers, and not in ferromagnetic-coupled sample. The negative Hc behavior was well agreed with the theoretical predictions.

AB - We investigated the negative coercivity (Hc) by using the Stoner-Wohlfarth model in antiferromagnetic-coupled hard/soft bilayers. We found out the conditions for negative Hc in terms of thickness (dH) and anisotropy energy(KH) of hard layer such as dH<0.5 and dHKH>2J in antiferromagnetic-coupled bilayers. In order to test our predictions experimentally, we prepared a series of synthetic exchange-coupled multilayer structure of MnIr/CoFe/Ru(x)/CoFe/MnIr thin film with x = 0.9, 1.0 and 1.1 nm. The inverted hysteresis loop with negative Hc was observed in antiferromagnetic-coupled multilayers, and not in ferromagnetic-coupled sample. The negative Hc behavior was well agreed with the theoretical predictions.

KW - Antiferromagnetic coupling

KW - Hard/soft magnet

KW - Negative coercivity

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U2 - 10.1016/j.jmmm.2006.01.198

DO - 10.1016/j.jmmm.2006.01.198

M3 - Article

AN - SCOPUS:33646870153

SN - 0304-8853

VL - 304

SP - e356-e358

JO - Journal of Magnetism and Magnetic Materials

JF - Journal of Magnetism and Magnetic Materials

IS - 1

ER -

Negative coercivity characteristics in antiferromagnetic coupled hard/soft multilayers

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