Large Exchange Bias after Zero-Field Cooling from an Unmagnetized State
Abstract
Exchange bias (EB) is usually observed in systems with an interface between different magnetic phases after field cooling. Here we report an unusual phenomenon in which a large EB can be observed in Ni-Mn-In bulk alloys after zero-field cooling from an unmagnetized state. We propose that this is related to the newly formed interface between different magnetic phases during the initial magnetization process. The magnetic unidirectional anisotropy, which is the origin of the EB effect, can be created isothermally below the blocking temperature.
- Publication:
-
Physical Review Letters
- Pub Date:
- February 2011
- DOI:
- 10.1103/PhysRevLett.106.077203
- arXiv:
- arXiv:1101.4737
- Bibcode:
- 2011PhRvL.106g7203W
- Keywords:
-
- 75.30.Et;
- 75.30.Gw;
- 75.50.Cc;
- 75.50.Lk;
- Exchange and superexchange interactions;
- Magnetic anisotropy;
- Other ferromagnetic metals and alloys;
- Spin glasses and other random magnets;
- Condensed Matter - Materials Science
- E-Print:
- including supplementary information, Accepted by Physical Review Letters