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Thomas S, Uhlig M, Wiedwald U, et al. Super spin-glass state and exchange bias in Fe/CoO hybrid nanostructures. Nanotechnology. 2013;24(15):155703doi: 10.1088/0957-4484/24/15/155703.
Thomas, S., Uhlig, M., Wiedwald, U., Han, L., Ziemann, P., & Albrecht, M. (2013). Super spin-glass state and exchange bias in Fe/CoO hybrid nanostructures. Nanotechnology, 24(15), 155703. https://doi.org/10.1088/0957-4484/24/15/155703
Thomas, S, et al. "Super spin-glass state and exchange bias in Fe/CoO hybrid nanostructures." Nanotechnology vol. 24,15 (2013): 155703. doi: https://doi.org/10.1088/0957-4484/24/15/155703
Thomas S, Uhlig M, Wiedwald U, Han L, Ziemann P, Albrecht M. Super spin-glass state and exchange bias in Fe/CoO hybrid nanostructures. Nanotechnology. 2013 Apr 19;24(15):155703. doi: 10.1088/0957-4484/24/15/155703. Epub 2013 Mar 22. PMID: 23518827.
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Nanotechnology. 2013 Apr 19;24(15):155703. doi: 10.1088/0957-4484/24/15/155703. Epub 2013 Mar 22.

Super spin-glass state and exchange bias in Fe/CoO hybrid nanostructures.

Nanotechnology

S Thomas, M Uhlig, U Wiedwald, L Han, P Ziemann, M Albrecht

Affiliations

  1. Institute of Physics, Chemnitz University of Technology, Chemnitz, Germany. [email protected]

PMID: 23518827 DOI: 10.1088/0957-4484/24/15/155703

Abstract

Fe/CoO heterostructures were realized by depositing Fe thin films on CoO nanoparticle arrays. Magnetization measurements revealed that 1 nm Fe exhibits a superparamagnetic behavior at 300 K and a super spin-glass state at temperatures below 80 K. The superparamagnetic as well as super spin-glass state vanishes for higher Fe film thicknesses once Fe starts to form a continuous layer across the CoO nanoparticle arrays. Furthermore, all samples exhibit an exchange bias effect at 6 K after field cooling, with a maximum exchange bias field of about 60 Oe for a Fe thickness of 2 nm. M-H loops of thicker Fe samples show a two-step magnetization reversal where Fe in the area in between CoO nanoparticles reverses at low fields, while, in proximity to the CoO nanoparticles, Fe switches at substantially higher fields. Both reversals are exchange biased.

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