Magnetic correlations in nanocomposite FePt:Au and FePt:C films

T. A. George, R. Skomski, David J Sellmyer

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

The nanostructure and magnetism of L 10 -ordered FePt crystallites in matrices of Au and C are investigated as a function of the Au and C contents. Emphasis is on the relation between hysteresis-loop shape, magnetic correlation length, and structural disorder, as relevant to magnetic recording media. The highly (001) textured thin films are produced by annealing [Fe/Pt/X] n multilayers. The coercivity and the hysteresis-loop slope at coercivity increase and decrease, respectively, with increasing volume fraction of the matrix. The magnetic force microscopy images show that the slope decrease is accompanied by a reduction in the magnetic correlation length. These changes are due to the reduced intergranular exchange coupling, and a simple model describes how interparticle exchange cooperatively increases both the loop slope and the correlation length.

Original languageEnglish (US)
Article number07B736
JournalJournal of Applied Physics
Volume105
Issue number7
DOIs
StatePublished - Apr 27 2009

Fingerprint

nanocomposites
slopes
coercivity
hysteresis
magnetic force microscopy
magnetic recording
matrices
crystallites
disorders
annealing
thin films

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Magnetic correlations in nanocomposite FePt:Au and FePt:C films. / George, T. A.; Skomski, R.; Sellmyer, David J.

In: Journal of Applied Physics, Vol. 105, No. 7, 07B736, 27.04.2009.

Research output: Contribution to journalArticle

@article{c6e6803a6dee471eacfc3dcc4e2328be,
title = "Magnetic correlations in nanocomposite FePt:Au and FePt:C films",
abstract = "The nanostructure and magnetism of L 10 -ordered FePt crystallites in matrices of Au and C are investigated as a function of the Au and C contents. Emphasis is on the relation between hysteresis-loop shape, magnetic correlation length, and structural disorder, as relevant to magnetic recording media. The highly (001) textured thin films are produced by annealing [Fe/Pt/X] n multilayers. The coercivity and the hysteresis-loop slope at coercivity increase and decrease, respectively, with increasing volume fraction of the matrix. The magnetic force microscopy images show that the slope decrease is accompanied by a reduction in the magnetic correlation length. These changes are due to the reduced intergranular exchange coupling, and a simple model describes how interparticle exchange cooperatively increases both the loop slope and the correlation length.",
author = "George, {T. A.} and R. Skomski and Sellmyer, {David J}",
year = "2009",
month = "4",
day = "27",
doi = "10.1063/1.3073653",
language = "English (US)",
volume = "105",
journal = "Journal of Applied Physics",
issn = "0021-8979",
publisher = "American Institute of Physics Publising LLC",
number = "7",

}

TY - JOUR

T1 - Magnetic correlations in nanocomposite FePt:Au and FePt:C films

AU - George, T. A.

AU - Skomski, R.

AU - Sellmyer, David J

PY - 2009/4/27

Y1 - 2009/4/27

N2 - The nanostructure and magnetism of L 10 -ordered FePt crystallites in matrices of Au and C are investigated as a function of the Au and C contents. Emphasis is on the relation between hysteresis-loop shape, magnetic correlation length, and structural disorder, as relevant to magnetic recording media. The highly (001) textured thin films are produced by annealing [Fe/Pt/X] n multilayers. The coercivity and the hysteresis-loop slope at coercivity increase and decrease, respectively, with increasing volume fraction of the matrix. The magnetic force microscopy images show that the slope decrease is accompanied by a reduction in the magnetic correlation length. These changes are due to the reduced intergranular exchange coupling, and a simple model describes how interparticle exchange cooperatively increases both the loop slope and the correlation length.

AB - The nanostructure and magnetism of L 10 -ordered FePt crystallites in matrices of Au and C are investigated as a function of the Au and C contents. Emphasis is on the relation between hysteresis-loop shape, magnetic correlation length, and structural disorder, as relevant to magnetic recording media. The highly (001) textured thin films are produced by annealing [Fe/Pt/X] n multilayers. The coercivity and the hysteresis-loop slope at coercivity increase and decrease, respectively, with increasing volume fraction of the matrix. The magnetic force microscopy images show that the slope decrease is accompanied by a reduction in the magnetic correlation length. These changes are due to the reduced intergranular exchange coupling, and a simple model describes how interparticle exchange cooperatively increases both the loop slope and the correlation length.

UR - http://www.scopus.com/inward/record.url?scp=65249108591&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=65249108591&partnerID=8YFLogxK

U2 - 10.1063/1.3073653

DO - 10.1063/1.3073653

M3 - Article

VL - 105

JO - Journal of Applied Physics

JF - Journal of Applied Physics

SN - 0021-8979

IS - 7

M1 - 07B736

ER -