Magnetization reversal and giant coercivity in Sm-Co/Cu-Ti particulate films

Jian Zhou; Arti Kashyap; Yi Liu; Ralph Skomski; David J. Sellmyer

doi:10.1109/TMAG.2004.829829

Magnetization reversal and giant coercivity in Sm-Co/Cu-Ti particulate films

Jian Zhou, Arti Kashyap, Yi Liu, Ralph Skomski, David J. Sellmyer

Physics and Astronomy

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

17 Scopus citations

Abstract

Highly coercive granular SmCo/CuTi films were produced by thermal processing of sputtered SmCos/(CuTi) multilayers and investigated experimentally and theoretically. Electron microscopy shows that the processed films consist of spherical grains that have diameters of 5-10 nm and are embedded in a matrix. Both the grains and the matrix phase exhibit the CaCu₅ structure, but the matrix is probably Cu-rich. The films have high coercivities of up to 50.4 kOe at 300 K. Analytical calculations and micromagnetic simulations yield a transition from a nucleation-type weak-interaction regime to a discrete-pinning-type strong-interaction regime. The transition occurs at packing fractions similar to those encountered in the investigated films and is accompanied by a coercivity maximum.

Original language	English (US)
Pages (from-to)	2940-2942
Number of pages	3
Journal	IEEE Transactions on Magnetics
Volume	40
Issue number	4 II
DOIs	https://doi.org/10.1109/TMAG.2004.829829
State	Published - Jul 2004

Keywords

Coercivity
Discrete domain-wall pinning
Granular films
Micromagnetic simulations
Samarium-cobalt films

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Electrical and Electronic Engineering

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10.1109/TMAG.2004.829829

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title = "Magnetization reversal and giant coercivity in Sm-Co/Cu-Ti particulate films",

abstract = "Highly coercive granular SmCo/CuTi films were produced by thermal processing of sputtered SmCos/(CuTi) multilayers and investigated experimentally and theoretically. Electron microscopy shows that the processed films consist of spherical grains that have diameters of 5-10 nm and are embedded in a matrix. Both the grains and the matrix phase exhibit the CaCu5 structure, but the matrix is probably Cu-rich. The films have high coercivities of up to 50.4 kOe at 300 K. Analytical calculations and micromagnetic simulations yield a transition from a nucleation-type weak-interaction regime to a discrete-pinning-type strong-interaction regime. The transition occurs at packing fractions similar to those encountered in the investigated films and is accompanied by a coercivity maximum.",

keywords = "Coercivity, Discrete domain-wall pinning, Granular films, Micromagnetic simulations, Samarium-cobalt films",

author = "Jian Zhou and Arti Kashyap and Yi Liu and Ralph Skomski and Sellmyer, {David J.}",

note = "Funding Information: Manuscript received October 16, 2003. This work was supported by DOE, AFOSR, NSF-MRSEC, and CMRA. The authors are with the Department of Physics and Astronomy and Center for Materials Research and Analysis, University of Nebraska, Lincoln, NE 68588 USA (e-mail: [email protected]). Digital Object Identifier 10.1109/TMAG.2004.829829 Fig. 1. Electron micrographs of a granular SmCo (b) HRTEM.",

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AU - Zhou, Jian

AU - Kashyap, Arti

AU - Liu, Yi

AU - Skomski, Ralph

AU - Sellmyer, David J.

N1 - Funding Information: Manuscript received October 16, 2003. This work was supported by DOE, AFOSR, NSF-MRSEC, and CMRA. The authors are with the Department of Physics and Astronomy and Center for Materials Research and Analysis, University of Nebraska, Lincoln, NE 68588 USA (e-mail: [email protected]). Digital Object Identifier 10.1109/TMAG.2004.829829 Fig. 1. Electron micrographs of a granular SmCo (b) HRTEM.

PY - 2004/7

Y1 - 2004/7

N2 - Highly coercive granular SmCo/CuTi films were produced by thermal processing of sputtered SmCos/(CuTi) multilayers and investigated experimentally and theoretically. Electron microscopy shows that the processed films consist of spherical grains that have diameters of 5-10 nm and are embedded in a matrix. Both the grains and the matrix phase exhibit the CaCu5 structure, but the matrix is probably Cu-rich. The films have high coercivities of up to 50.4 kOe at 300 K. Analytical calculations and micromagnetic simulations yield a transition from a nucleation-type weak-interaction regime to a discrete-pinning-type strong-interaction regime. The transition occurs at packing fractions similar to those encountered in the investigated films and is accompanied by a coercivity maximum.

AB - Highly coercive granular SmCo/CuTi films were produced by thermal processing of sputtered SmCos/(CuTi) multilayers and investigated experimentally and theoretically. Electron microscopy shows that the processed films consist of spherical grains that have diameters of 5-10 nm and are embedded in a matrix. Both the grains and the matrix phase exhibit the CaCu5 structure, but the matrix is probably Cu-rich. The films have high coercivities of up to 50.4 kOe at 300 K. Analytical calculations and micromagnetic simulations yield a transition from a nucleation-type weak-interaction regime to a discrete-pinning-type strong-interaction regime. The transition occurs at packing fractions similar to those encountered in the investigated films and is accompanied by a coercivity maximum.

KW - Coercivity

KW - Discrete domain-wall pinning

KW - Granular films

KW - Micromagnetic simulations

KW - Samarium-cobalt films

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Magnetization reversal and giant coercivity in Sm-Co/Cu-Ti particulate films

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Keywords

ASJC Scopus subject areas

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