Antiferromagnetic exchange spring as the reason of exchange bias training effect

作者：Dobrynin A N^*; Maccherozzi F; Dhesi S S; Fan R; Bencok P; Steadman P

来源：Applied Physics Letters, 2014, 105(3): 032407.

DOI：10.1063/1.4891651

We observe recovery of the exchange bias training effect in a Co/CoO bilayer after warming the sample up to the blocking temperature and cooling it back to a low measuring temperature in zero magnetic field. Variation of the magnitude of X-ray magnetic linear dichroism in the sample for the system in the high unidirectional anisotropy state (after field cooling) and in the low unidirectional anisotropy state (after training) suggests rearrangement of antiferromagnetic structure during the initial field cycling in exchange biased state. Our results suggest formation of an antiferromagnetic exchange spring at the frustrated ferromagnetic-antiferromagnetic interface being the reason of the training effect.

• 出版日期2014-7-21