Coercivity of disordered nanostructures

R. Skomski, D. Leslie-Pelecky, R. D. Kirby, A. Kashyap, David J Sellmyer

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Zero- and finite-temperature coercivity mechanisms in disordered nanostructures are investigated by model calculations. Three different aspects are considered. First, it is shown that strongly reduced exchange in grain-boundary regions changes the power-law scaling exponent for the coercivity of random-anisotropy magnets. Second, it is analyzed how random interatomic exchange affects the thermal blocking and therefore the coercivity of spin glasses. Third, a master-equation approach is used to quantitatively elucidate the relation between the magnetic-viscosity regime and the sweep-rate dependence of the coercivity. A common feature of the considered mechanisms is that interatomic exchange creates nanoscale cooperative units which realize the coercivity in real space.

Original languageEnglish (US)
Pages (from-to)857-862
Number of pages6
JournalScripta Materialia
Volume48
Issue number7
DOIs
StatePublished - Apr 1 2003

Fingerprint

Coercive force
coercivity
Nanostructures
Magnetic after effect
Spin glass
Scaling laws
scaling laws
spin glass
Magnets
Grain boundaries
Anisotropy
magnets
grain boundaries
exponents
viscosity
anisotropy
Temperature
temperature

Keywords

  • Coercivity
  • Free energy
  • Magnetic viscosity
  • Magnetization dynamics
  • Random anisotropy

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Skomski, R., Leslie-Pelecky, D., Kirby, R. D., Kashyap, A., & Sellmyer, D. J. (2003). Coercivity of disordered nanostructures. Scripta Materialia, 48(7), 857-862. https://doi.org/10.1016/S1359-6462(02)00622-X

Coercivity of disordered nanostructures. / Skomski, R.; Leslie-Pelecky, D.; Kirby, R. D.; Kashyap, A.; Sellmyer, David J.

In: Scripta Materialia, Vol. 48, No. 7, 01.04.2003, p. 857-862.

Research output: Contribution to journalArticle

Skomski, R, Leslie-Pelecky, D, Kirby, RD, Kashyap, A & Sellmyer, DJ 2003, 'Coercivity of disordered nanostructures', Scripta Materialia, vol. 48, no. 7, pp. 857-862. https://doi.org/10.1016/S1359-6462(02)00622-X
Skomski R, Leslie-Pelecky D, Kirby RD, Kashyap A, Sellmyer DJ. Coercivity of disordered nanostructures. Scripta Materialia. 2003 Apr 1;48(7):857-862. https://doi.org/10.1016/S1359-6462(02)00622-X
Skomski, R. ; Leslie-Pelecky, D. ; Kirby, R. D. ; Kashyap, A. ; Sellmyer, David J. / Coercivity of disordered nanostructures. In: Scripta Materialia. 2003 ; Vol. 48, No. 7. pp. 857-862.
@article{242cfd399ebb4df7ab8e62d3594ec534,
title = "Coercivity of disordered nanostructures",
abstract = "Zero- and finite-temperature coercivity mechanisms in disordered nanostructures are investigated by model calculations. Three different aspects are considered. First, it is shown that strongly reduced exchange in grain-boundary regions changes the power-law scaling exponent for the coercivity of random-anisotropy magnets. Second, it is analyzed how random interatomic exchange affects the thermal blocking and therefore the coercivity of spin glasses. Third, a master-equation approach is used to quantitatively elucidate the relation between the magnetic-viscosity regime and the sweep-rate dependence of the coercivity. A common feature of the considered mechanisms is that interatomic exchange creates nanoscale cooperative units which realize the coercivity in real space.",
keywords = "Coercivity, Free energy, Magnetic viscosity, Magnetization dynamics, Random anisotropy",
author = "R. Skomski and D. Leslie-Pelecky and Kirby, {R. D.} and A. Kashyap and Sellmyer, {David J}",
year = "2003",
month = "4",
day = "1",
doi = "10.1016/S1359-6462(02)00622-X",
language = "English (US)",
volume = "48",
pages = "857--862",
journal = "Scripta Materialia",
issn = "1359-6462",
publisher = "Elsevier Limited",
number = "7",

}

TY - JOUR

T1 - Coercivity of disordered nanostructures

AU - Skomski, R.

AU - Leslie-Pelecky, D.

AU - Kirby, R. D.

AU - Kashyap, A.

AU - Sellmyer, David J

PY - 2003/4/1

Y1 - 2003/4/1

N2 - Zero- and finite-temperature coercivity mechanisms in disordered nanostructures are investigated by model calculations. Three different aspects are considered. First, it is shown that strongly reduced exchange in grain-boundary regions changes the power-law scaling exponent for the coercivity of random-anisotropy magnets. Second, it is analyzed how random interatomic exchange affects the thermal blocking and therefore the coercivity of spin glasses. Third, a master-equation approach is used to quantitatively elucidate the relation between the magnetic-viscosity regime and the sweep-rate dependence of the coercivity. A common feature of the considered mechanisms is that interatomic exchange creates nanoscale cooperative units which realize the coercivity in real space.

AB - Zero- and finite-temperature coercivity mechanisms in disordered nanostructures are investigated by model calculations. Three different aspects are considered. First, it is shown that strongly reduced exchange in grain-boundary regions changes the power-law scaling exponent for the coercivity of random-anisotropy magnets. Second, it is analyzed how random interatomic exchange affects the thermal blocking and therefore the coercivity of spin glasses. Third, a master-equation approach is used to quantitatively elucidate the relation between the magnetic-viscosity regime and the sweep-rate dependence of the coercivity. A common feature of the considered mechanisms is that interatomic exchange creates nanoscale cooperative units which realize the coercivity in real space.

KW - Coercivity

KW - Free energy

KW - Magnetic viscosity

KW - Magnetization dynamics

KW - Random anisotropy

UR - http://www.scopus.com/inward/record.url?scp=0037393947&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0037393947&partnerID=8YFLogxK

U2 - 10.1016/S1359-6462(02)00622-X

DO - 10.1016/S1359-6462(02)00622-X

M3 - Article

VL - 48

SP - 857

EP - 862

JO - Scripta Materialia

JF - Scripta Materialia

SN - 1359-6462

IS - 7

ER -