Surface induced suppression of magnetization in nanoparticles

C. Westman; S. Jang; C. Kim; S. He; G. Harmon; N. Miller; B. Graves; N. Poudyal; R. Sabirianov; H. Zeng; M. Demarco; J. P. Liu

doi:10.1088/0022-3727/41/22/225003

Surface induced suppression of magnetization in nanoparticles

C. Westman, S. Jang, C. Kim, S. He, G. Harmon, N. Miller, B. Graves, N. Poudyal, R. Sabirianov, H. Zeng, M. Demarco, J. P. Liu

Physics

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

18 Scopus citations

Abstract

A model based on competing exchange interactions is presented for the investigation of nanoparticle magnetization. The ferromagnetic (FM) and antiferromagnetic (AFM) exchange interactions contribute differently at the nanoparticle surface and interior, leading to reduced ferromagnetic order at the surface. This model predicts an unconventional temperature dependence of magnetization and a surface magnetically 'dead layer'. This is confirmed by temperature dependent magnetization and Mössbauer measurements of FePt nanoparticles. The effects are sensitive to particle size and surface terminations.

Original language	English (US)
Article number	225003
Journal	Journal of Physics D: Applied Physics
Volume	41
Issue number	22
DOIs	https://doi.org/10.1088/0022-3727/41/22/225003
State	Published - Nov 21 2008

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Acoustics and Ultrasonics
Surfaces, Coatings and Films

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title = "Surface induced suppression of magnetization in nanoparticles",

abstract = "A model based on competing exchange interactions is presented for the investigation of nanoparticle magnetization. The ferromagnetic (FM) and antiferromagnetic (AFM) exchange interactions contribute differently at the nanoparticle surface and interior, leading to reduced ferromagnetic order at the surface. This model predicts an unconventional temperature dependence of magnetization and a surface magnetically 'dead layer'. This is confirmed by temperature dependent magnetization and M{\"o}ssbauer measurements of FePt nanoparticles. The effects are sensitive to particle size and surface terminations.",

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T1 - Surface induced suppression of magnetization in nanoparticles

AU - Westman, C.

AU - Jang, S.

AU - Kim, C.

AU - He, S.

AU - Harmon, G.

AU - Miller, N.

AU - Graves, B.

AU - Poudyal, N.

AU - Sabirianov, R.

AU - Zeng, H.

AU - Demarco, M.

AU - Liu, J. P.

PY - 2008/11/21

Y1 - 2008/11/21

N2 - A model based on competing exchange interactions is presented for the investigation of nanoparticle magnetization. The ferromagnetic (FM) and antiferromagnetic (AFM) exchange interactions contribute differently at the nanoparticle surface and interior, leading to reduced ferromagnetic order at the surface. This model predicts an unconventional temperature dependence of magnetization and a surface magnetically 'dead layer'. This is confirmed by temperature dependent magnetization and Mössbauer measurements of FePt nanoparticles. The effects are sensitive to particle size and surface terminations.

AB - A model based on competing exchange interactions is presented for the investigation of nanoparticle magnetization. The ferromagnetic (FM) and antiferromagnetic (AFM) exchange interactions contribute differently at the nanoparticle surface and interior, leading to reduced ferromagnetic order at the surface. This model predicts an unconventional temperature dependence of magnetization and a surface magnetically 'dead layer'. This is confirmed by temperature dependent magnetization and Mössbauer measurements of FePt nanoparticles. The effects are sensitive to particle size and surface terminations.

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VL - 41

JO - Journal Physics D: Applied Physics

JF - Journal Physics D: Applied Physics

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Surface induced suppression of magnetization in nanoparticles

Abstract

ASJC Scopus subject areas

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