Positive exchange bias in FeF2-Fe bilayers
Nogués, Josep (University of California-San Diego. Physics Department)
Lederman, D. (West Virginia University. Physics Department)
Moran, T. J.. (University of California, San Diego. Department of Physics)
Schuller, Ivan K. (University of California, San Diego. Department of Physics)
American Physical Society

Date:	1996
Abstract:	We have discovered a positive unidirectional exchange anisotropy in antiferromagnetic (FeF2) and ferromagnetic (Fe) bilayers cooled through the antiferromagnetic critical temperature TN in large magnetic fields. For low positive cooling fields, the ferromagnet's magnetization ( M−H) loop center shifts to negative fields, as is normally observed in other systems. In contrast, large cooling fields can cause the shift to be positive. This can be explained if the FeF2 surface spins couple to the external magnetic cooling field above TN and the FeF2-Fe interaction is antiferromagnetic.
Rights:	Tots els drets reservats.
Language:	Anglès
Document:	Article ; Versió publicada
Published in:	Physical review letters, Vol. 76, Issue 24 (June 1996) , p. 4624-4627, ISSN 1079-7114

DOI: 10.1103/PhysRevLett.76.4624

4 p, 128.4 KB

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Research literature > UAB research groups literature > Research Centres and Groups (research output) > Experimental sciences > Group of Smart Nanoengineered Materials, Nanomechanics and Nanomagnetism (Gnm3)
Articles > Published articles