EPL (Europhysics Letters)

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EPL (Europhysics Letters) Volume 77 Number 5 Create an alert RSS this journal

M. Gruyters 2007 EPL 77 57006 doi:10.1209/0295-5075/77/57006

Exchange bias in granular CoO layers due to random magnetic anisotropy

M. Gruyters

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Abstract References Cited By

The structural and magnetic properties of granular CoO layers have been investigated by scanning tunneling microscopy (STM) and magnetization measurements. The CoO shows a strong exchange anisotropy which is attributed to an interaction between the antiferromagnetic order and uncompensated spins in the antiferromagnetic material. No appreciable amount of ferromagnetic material is needed to establish characteristic properties of exchange bias such as the shift of the magnetic hysteresis loop. A new approach to the problem of exchange anisotropy is suggested which is based on random magnetic anisotropy of CoO nanoparticles.


PACS

75.70.-i Magnetic properties of thin films, surfaces, and interfaces

75.50.Ee Antiferromagnetics

75.50.Lk Spin glasses and other random magnets

Subjects

Condensed matter: electrical, magnetic and optical

Surfaces, interfaces and thin films

Dates

Issue 5 (March 2007)

Received 9 October 2006, in final form 19 January 2007

Published 22 February 2007



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