High coercivity and magnetic domain observation in epitaxially grown particulate FePt thin films

T. Shima; K. Takanashi; Y. K. Takahashi; K. Hono; G. Q. Li; S. Ishio

doi:10.1016/S0304-8853(03)00468-2

High coercivity and magnetic domain observation in epitaxially grown particulate FePt thin films

T. Shima^*, K. Takanashi, Y. K. Takahashi, K. Hono, G. Q. Li, S. Ishio

^*Corresponding author for this work

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

30 Citations (Scopus)

Abstract

We have investigated the magnetic domains of high coercive FePt[001]/MgO[001] films with various morphologies by magnetic force microscopy (MFM). The film morphology changes from particulate to continuous depending on the film thickness (t), accompanied by a drastic decrease in coercivity when t exceeds the critical thickness, t_c = 45 nm. The film with t = 10 nm is comprised of only single-domain particles of approximately 50 nm, which has a huge coercivity as high as 40kOe. The isolated particles larger than 200 nm are multi-domain, and the films containing these isolated particles show slightly lower coercivity. The coercivity drastically decreases with the percolation of the particles.

Original language	English
Pages (from-to)	171-177
Number of pages	7
Journal	Journal of Magnetism and Magnetic Materials
Volume	266
Issue number	1-2
DOIs	https://doi.org/10.1016/S0304-8853(03)00468-2
Publication status	Published - 2003 Oct
Externally published	Yes

Keywords

FePt
Magnetic domain structure
Microstructure
Sputtering
Thin film

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1016/S0304-8853(03)00468-2

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title = "High coercivity and magnetic domain observation in epitaxially grown particulate FePt thin films",

abstract = "We have investigated the magnetic domains of high coercive FePt[001]/MgO[001] films with various morphologies by magnetic force microscopy (MFM). The film morphology changes from particulate to continuous depending on the film thickness (t), accompanied by a drastic decrease in coercivity when t exceeds the critical thickness, tc = 45 nm. The film with t = 10 nm is comprised of only single-domain particles of approximately 50 nm, which has a huge coercivity as high as 40kOe. The isolated particles larger than 200 nm are multi-domain, and the films containing these isolated particles show slightly lower coercivity. The coercivity drastically decreases with the percolation of the particles.",

keywords = "FePt, Magnetic domain structure, Microstructure, Sputtering, Thin film",

author = "T. Shima and K. Takanashi and Takahashi, {Y. K.} and K. Hono and Li, {G. Q.} and S. Ishio",

note = "Funding Information: This work is partly supported by the Special Coordination Funds for Promoting Science and Technology on “Nanohetero Metallic Materials” from the Ministry of Education, Culture, Sports, Science and Technology and also supported by Core Research for Evolutional Science and Technology (CREST) of Japan Science and Technology Cooperation. The structural characterization was performed at Laboratory for Advanced Materials, IMR, Tohoku University. The authors would like to acknowledge Dr. S. Mitani, Dr. S. Sugimoto, Dr. T. Kaneko for useful discussion; Mr. Y. Murakami for technical assistance.",

year = "2003",

month = oct,

doi = "10.1016/S0304-8853(03)00468-2",

language = "English",

volume = "266",

pages = "171--177",

journal = "Journal of Magnetism and Magnetic Materials",

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TY - JOUR

T1 - High coercivity and magnetic domain observation in epitaxially grown particulate FePt thin films

AU - Shima, T.

AU - Takanashi, K.

AU - Takahashi, Y. K.

AU - Hono, K.

AU - Li, G. Q.

AU - Ishio, S.

N1 - Funding Information: This work is partly supported by the Special Coordination Funds for Promoting Science and Technology on “Nanohetero Metallic Materials” from the Ministry of Education, Culture, Sports, Science and Technology and also supported by Core Research for Evolutional Science and Technology (CREST) of Japan Science and Technology Cooperation. The structural characterization was performed at Laboratory for Advanced Materials, IMR, Tohoku University. The authors would like to acknowledge Dr. S. Mitani, Dr. S. Sugimoto, Dr. T. Kaneko for useful discussion; Mr. Y. Murakami for technical assistance.

PY - 2003/10

Y1 - 2003/10

N2 - We have investigated the magnetic domains of high coercive FePt[001]/MgO[001] films with various morphologies by magnetic force microscopy (MFM). The film morphology changes from particulate to continuous depending on the film thickness (t), accompanied by a drastic decrease in coercivity when t exceeds the critical thickness, tc = 45 nm. The film with t = 10 nm is comprised of only single-domain particles of approximately 50 nm, which has a huge coercivity as high as 40kOe. The isolated particles larger than 200 nm are multi-domain, and the films containing these isolated particles show slightly lower coercivity. The coercivity drastically decreases with the percolation of the particles.

AB - We have investigated the magnetic domains of high coercive FePt[001]/MgO[001] films with various morphologies by magnetic force microscopy (MFM). The film morphology changes from particulate to continuous depending on the film thickness (t), accompanied by a drastic decrease in coercivity when t exceeds the critical thickness, tc = 45 nm. The film with t = 10 nm is comprised of only single-domain particles of approximately 50 nm, which has a huge coercivity as high as 40kOe. The isolated particles larger than 200 nm are multi-domain, and the films containing these isolated particles show slightly lower coercivity. The coercivity drastically decreases with the percolation of the particles.

KW - FePt

KW - Magnetic domain structure

KW - Microstructure

KW - Sputtering

KW - Thin film

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DO - 10.1016/S0304-8853(03)00468-2

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SN - 0304-8853

VL - 266

SP - 171

EP - 177

JO - Journal of Magnetism and Magnetic Materials

JF - Journal of Magnetism and Magnetic Materials

IS - 1-2

ER -

High coercivity and magnetic domain observation in epitaxially grown particulate FePt thin films

Abstract

Keywords

ASJC Scopus subject areas

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