| Issue |
EPL
Volume 77, Number 5, March 2007
|
|
|---|---|---|
| Article Number | 57006 | |
| Number of page(s) | 5 | |
| Section | Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties | |
| DOI | https://doi.org/10.1209/0295-5075/77/57006 | |
| Published online | 22 February 2007 | |
Exchange bias in granular CoO layers due to random magnetic anisotropy
Institut für Physik, Humboldt-Universität zu Berlin - Newtonstrasse 15, 12489 Berlin, Germany
Received:
9
October
2006
Accepted:
19
January
2007
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
© Europhysics Letters Association, 2007
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