DOI: 10.1063/1.370280. Dependence of exchange anisotropy and coercivity on the Fe–oxide structure in oxygen-passivated Fe nanoparticles

Dependence of exchange anisotropy and coercivity on the Fe–oxide structure in oxygen-passivated Fe nanoparticles

10.1063/1.370280

Crossref journal-article

AIP Publishing

Journal of Applied Physics (317)

Abstract

Ultrafine Fe particles have been prepared by the inert gas condensation method and subsequently oxygen passivated. The as-obtained particles consist in an Fe core surrounded by an amorphous Fe-oxide surface layer. The antiferromagnetic character of the Fe-oxide surface induces an exchange anisotropy in the ferromagnetic Fe core when the system is field cooled. Samples have been heat treated in vacuum at different temperatures. Structural changes of the Fe–O layer have been monitored by x-ray diffraction and transmission electron microscopy. Magnetic properties as coercivity, hysteresis loop shift, and evolution of magnetization with temperature have been analyzed for different oxide crystallization stages. A decrease of the exchange anisotropy strength is reported as the structural disorder of the surface oxide layer is decreased with thermal treatment.

Bibliography

Prados, C., Multigner, M., Hernando, A., SÃ¡nchez, J. C., FernÃ¡ndez, A., Conde, C. F., & Conde, A. (1999). Dependence of exchange anisotropy and coercivity on the Feâoxide structure in oxygen-passivated Fe nanoparticles. Journal of Applied Physics, 85(8), 6118â6120.

Authors 7

C. Prados (first)
M. Multigner (additional)
A. Hernando (additional)
J. C. Sánchez (additional)
A. Fernández (additional)
C. F. Conde (additional)
A. Conde (additional)

References 15 Referenced 49

{'key': '2024021007544939200_r1'}
10.1016/0304-8853(96)00356-3 / J. Magn. Magn. Mater. (1996)
{'key': '2024021007544939200_r3'}
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10.1016/0079-6425(89)90001-7 / Prog. Mater. Sci. (1989)
10.1063/1.115819 / Appl. Phys. Lett. (1996)
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Dates

Type	When
Created	23 years, 1 month ago (July 26, 2002, 9:55 a.m.)
Deposited	1 year, 6 months ago (Feb. 10, 2024, 4:48 a.m.)
Indexed	2 months, 1 week ago (June 24, 2025, 7:28 a.m.)
Issued	26 years, 4 months ago (April 15, 1999)
Published	26 years, 4 months ago (April 15, 1999)
Published Print	26 years, 4 months ago (April 15, 1999)

Funders 0

None

BibTeX

@article{Prados_1999, title={Dependence of exchange anisotropy and coercivity on the Fe–oxide structure in oxygen-passivated Fe nanoparticles}, volume={85}, ISSN={1089-7550}, url={http://dx.doi.org/10.1063/1.370280}, DOI={10.1063/1.370280}, number={8}, journal={Journal of Applied Physics}, publisher={AIP Publishing}, author={Prados, C. and Multigner, M. and Hernando, A. and Sánchez, J. C. and Fernández, A. and Conde, C. F. and Conde, A.}, year={1999}, month=apr, pages={6118–6120} }

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