Enhancement of coercivity in nanometer-size CoPt crystallites

Sy-Hwang Liou, S. Huang, E. Klimek, R. D. Kirby, Y. D. Yao

Research output: Contribution to journalArticle

67 Citations (Scopus)

Abstract

In this study, we showed that a magnetic coercivity (H c ) as high as 37 kOe was obtained in a CoPt thin film that contains separated nanometer-size CoPt crystallites. We prepared CoPt thin films with thicknesses of 5 and 175 nm by magnetron sputtering. After annealing in an Ar/H 2 atmosphere at temperatures from 650 to 750°C for 3-12 h, we measured the magnetic properties and found that magnetic H c relates to annealing temperature, annealing time and film thickness. From atomic force microscopy and magnetic force microscopy studies, the magnetic single domain size of CoPt is in the range of 100-200 nm. The high H c is likely due to the well-separated nanometer-size crystallites and the well-ordered fct phase of CoPt alloy.

Original languageEnglish (US)
Pages (from-to)4334-4336
Number of pages3
JournalJournal of Applied Physics
Volume85
Issue number8 II A
StatePublished - Apr 15 1999

Fingerprint

crystallites
coercivity
annealing
augmentation
magnetic force microscopy
thin films
magnetron sputtering
film thickness
atomic force microscopy
magnetic properties
atmospheres
temperature

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Liou, S-H., Huang, S., Klimek, E., Kirby, R. D., & Yao, Y. D. (1999). Enhancement of coercivity in nanometer-size CoPt crystallites. Journal of Applied Physics, 85(8 II A), 4334-4336.

Enhancement of coercivity in nanometer-size CoPt crystallites. / Liou, Sy-Hwang; Huang, S.; Klimek, E.; Kirby, R. D.; Yao, Y. D.

In: Journal of Applied Physics, Vol. 85, No. 8 II A, 15.04.1999, p. 4334-4336.

Research output: Contribution to journalArticle

Liou, S-H, Huang, S, Klimek, E, Kirby, RD & Yao, YD 1999, 'Enhancement of coercivity in nanometer-size CoPt crystallites', Journal of Applied Physics, vol. 85, no. 8 II A, pp. 4334-4336.
Liou S-H, Huang S, Klimek E, Kirby RD, Yao YD. Enhancement of coercivity in nanometer-size CoPt crystallites. Journal of Applied Physics. 1999 Apr 15;85(8 II A):4334-4336.
Liou, Sy-Hwang ; Huang, S. ; Klimek, E. ; Kirby, R. D. ; Yao, Y. D. / Enhancement of coercivity in nanometer-size CoPt crystallites. In: Journal of Applied Physics. 1999 ; Vol. 85, No. 8 II A. pp. 4334-4336.
@article{71b93ffdc86e4eee9f56031eae132c13,
title = "Enhancement of coercivity in nanometer-size CoPt crystallites",
abstract = "In this study, we showed that a magnetic coercivity (H c ) as high as 37 kOe was obtained in a CoPt thin film that contains separated nanometer-size CoPt crystallites. We prepared CoPt thin films with thicknesses of 5 and 175 nm by magnetron sputtering. After annealing in an Ar/H 2 atmosphere at temperatures from 650 to 750°C for 3-12 h, we measured the magnetic properties and found that magnetic H c relates to annealing temperature, annealing time and film thickness. From atomic force microscopy and magnetic force microscopy studies, the magnetic single domain size of CoPt is in the range of 100-200 nm. The high H c is likely due to the well-separated nanometer-size crystallites and the well-ordered fct phase of CoPt alloy.",
author = "Sy-Hwang Liou and S. Huang and E. Klimek and Kirby, {R. D.} and Yao, {Y. D.}",
year = "1999",
month = "4",
day = "15",
language = "English (US)",
volume = "85",
pages = "4334--4336",
journal = "Journal of Applied Physics",
issn = "0021-8979",
publisher = "American Institute of Physics Publising LLC",
number = "8 II A",

}

TY - JOUR

T1 - Enhancement of coercivity in nanometer-size CoPt crystallites

AU - Liou, Sy-Hwang

AU - Huang, S.

AU - Klimek, E.

AU - Kirby, R. D.

AU - Yao, Y. D.

PY - 1999/4/15

Y1 - 1999/4/15

N2 - In this study, we showed that a magnetic coercivity (H c ) as high as 37 kOe was obtained in a CoPt thin film that contains separated nanometer-size CoPt crystallites. We prepared CoPt thin films with thicknesses of 5 and 175 nm by magnetron sputtering. After annealing in an Ar/H 2 atmosphere at temperatures from 650 to 750°C for 3-12 h, we measured the magnetic properties and found that magnetic H c relates to annealing temperature, annealing time and film thickness. From atomic force microscopy and magnetic force microscopy studies, the magnetic single domain size of CoPt is in the range of 100-200 nm. The high H c is likely due to the well-separated nanometer-size crystallites and the well-ordered fct phase of CoPt alloy.

AB - In this study, we showed that a magnetic coercivity (H c ) as high as 37 kOe was obtained in a CoPt thin film that contains separated nanometer-size CoPt crystallites. We prepared CoPt thin films with thicknesses of 5 and 175 nm by magnetron sputtering. After annealing in an Ar/H 2 atmosphere at temperatures from 650 to 750°C for 3-12 h, we measured the magnetic properties and found that magnetic H c relates to annealing temperature, annealing time and film thickness. From atomic force microscopy and magnetic force microscopy studies, the magnetic single domain size of CoPt is in the range of 100-200 nm. The high H c is likely due to the well-separated nanometer-size crystallites and the well-ordered fct phase of CoPt alloy.

UR - http://www.scopus.com/inward/record.url?scp=0001765163&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0001765163&partnerID=8YFLogxK

M3 - Article

VL - 85

SP - 4334

EP - 4336

JO - Journal of Applied Physics

JF - Journal of Applied Physics

SN - 0021-8979

IS - 8 II A

ER -