Magnetic structures at the ferromagnetic NiFe and antiferromagnetic NiMn interface in exchange-biased films: Role of noncollinear magnetism and roughness

Kohji Nakamura, Arthur J Freeman, Ding Sheng Wang, Lieping Zhong, Juan Fernandez-De-Castro

Research output: Contribution to journalArticle

36 Citations (Scopus)

Abstract

The magnetic structures at the compensated ferromagnetic/antiferromagnetic (FM/AFM) interface of exchange bias FM NiFe/AFM NiMn films were determined with first-principles full-potential linearized augmented plane-wave calculations including noncollinear magnetism. The results predict that the magnetic moments of the FM NiFe layer lie perpendicular to those of the AFM NiMn layer. The intra-atomic noncollinear magnetism that arises near the interface is found to play an important role in stabilizing the perpendicular coupling that leads to a large biquadratic exchange energy (BEE). The BEE is large enough to require formation of a magnetic domain wall (with an estimated thickness ∼ 370 Å) in the AFM NiMn layers, which may account for the observed large coercivity and exchange bias. We also discuss magnetic structures at a rough FM/AFM interface-as simulated in model calculations with the inclusion of line step defects-which may contribute to a unidirectional magnetic anisotropy.

Original languageEnglish
Article number012402
Pages (from-to)124021-124024
Number of pages4
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume65
Issue number1
Publication statusPublished - Jan 1 2002

Fingerprint

Magnetic structure
Magnetism
roughness
Surface roughness
atomic force microscopy
frequency modulation
Magnetic domains
Magnetic anisotropy
Domain walls
Coercive force
Magnetic moments
energy transfer
magnetic domains
Defects
coercivity
domain wall
plane waves
magnetic moments
inclusions
anisotropy

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Magnetic structures at the ferromagnetic NiFe and antiferromagnetic NiMn interface in exchange-biased films : Role of noncollinear magnetism and roughness. / Nakamura, Kohji; Freeman, Arthur J; Wang, Ding Sheng; Zhong, Lieping; Fernandez-De-Castro, Juan.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 65, No. 1, 012402, 01.01.2002, p. 124021-124024.

Research output: Contribution to journalArticle

@article{3184ef370eff4a2698a7ad56d044f498,
title = "Magnetic structures at the ferromagnetic NiFe and antiferromagnetic NiMn interface in exchange-biased films: Role of noncollinear magnetism and roughness",
abstract = "The magnetic structures at the compensated ferromagnetic/antiferromagnetic (FM/AFM) interface of exchange bias FM NiFe/AFM NiMn films were determined with first-principles full-potential linearized augmented plane-wave calculations including noncollinear magnetism. The results predict that the magnetic moments of the FM NiFe layer lie perpendicular to those of the AFM NiMn layer. The intra-atomic noncollinear magnetism that arises near the interface is found to play an important role in stabilizing the perpendicular coupling that leads to a large biquadratic exchange energy (BEE). The BEE is large enough to require formation of a magnetic domain wall (with an estimated thickness ∼ 370 {\AA}) in the AFM NiMn layers, which may account for the observed large coercivity and exchange bias. We also discuss magnetic structures at a rough FM/AFM interface-as simulated in model calculations with the inclusion of line step defects-which may contribute to a unidirectional magnetic anisotropy.",
author = "Kohji Nakamura and Freeman, {Arthur J} and Wang, {Ding Sheng} and Lieping Zhong and Juan Fernandez-De-Castro",
year = "2002",
month = "1",
day = "1",
language = "English",
volume = "65",
pages = "124021--124024",
journal = "Physical Review B-Condensed Matter",
issn = "1098-0121",
publisher = "American Physical Society",
number = "1",

}

TY - JOUR

T1 - Magnetic structures at the ferromagnetic NiFe and antiferromagnetic NiMn interface in exchange-biased films

T2 - Role of noncollinear magnetism and roughness

AU - Nakamura, Kohji

AU - Freeman, Arthur J

AU - Wang, Ding Sheng

AU - Zhong, Lieping

AU - Fernandez-De-Castro, Juan

PY - 2002/1/1

Y1 - 2002/1/1

N2 - The magnetic structures at the compensated ferromagnetic/antiferromagnetic (FM/AFM) interface of exchange bias FM NiFe/AFM NiMn films were determined with first-principles full-potential linearized augmented plane-wave calculations including noncollinear magnetism. The results predict that the magnetic moments of the FM NiFe layer lie perpendicular to those of the AFM NiMn layer. The intra-atomic noncollinear magnetism that arises near the interface is found to play an important role in stabilizing the perpendicular coupling that leads to a large biquadratic exchange energy (BEE). The BEE is large enough to require formation of a magnetic domain wall (with an estimated thickness ∼ 370 Å) in the AFM NiMn layers, which may account for the observed large coercivity and exchange bias. We also discuss magnetic structures at a rough FM/AFM interface-as simulated in model calculations with the inclusion of line step defects-which may contribute to a unidirectional magnetic anisotropy.

AB - The magnetic structures at the compensated ferromagnetic/antiferromagnetic (FM/AFM) interface of exchange bias FM NiFe/AFM NiMn films were determined with first-principles full-potential linearized augmented plane-wave calculations including noncollinear magnetism. The results predict that the magnetic moments of the FM NiFe layer lie perpendicular to those of the AFM NiMn layer. The intra-atomic noncollinear magnetism that arises near the interface is found to play an important role in stabilizing the perpendicular coupling that leads to a large biquadratic exchange energy (BEE). The BEE is large enough to require formation of a magnetic domain wall (with an estimated thickness ∼ 370 Å) in the AFM NiMn layers, which may account for the observed large coercivity and exchange bias. We also discuss magnetic structures at a rough FM/AFM interface-as simulated in model calculations with the inclusion of line step defects-which may contribute to a unidirectional magnetic anisotropy.

UR - http://www.scopus.com/inward/record.url?scp=0036149252&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0036149252&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:0036149252

VL - 65

SP - 124021

EP - 124024

JO - Physical Review B-Condensed Matter

JF - Physical Review B-Condensed Matter

SN - 1098-0121

IS - 1

M1 - 012402

ER -