Temperature-dependent exchange bias properties of polycrystalline PtxCo1− x/CoO bilayers

Cooling field and temperature dependent exchange bias in spin glass/ferromagnet bilayers

We report on the experimental and theoretical studies of cooling field (HFC) and temperature (T) dependent exchange bias (EB) in FexAu1-x/Fe19Ni81 spin glass (SG)/ferromagnet (FM) bilayers. When x varies from 8% to 14% in the FexAu1-x SG alloys, with increasing T, a sign-changeable exchange bias field (HE) together with a unimodal distribution of coercivity (HC) are observed. Significantly, inc...

Asymmetric recovery effect of exchange bias in polycrystalline NiFe/FeMn bilayers

NiFe/FeMn bilayers X. P. Qiu, Z. Shi, S. M. Zhou, J. Du, X. J. Bai, R. Chantrell, and L. Sun Department of Physics and Surface Physics Laboratory (National Key Laboratory), Fudan University, Shanghai 200433, China National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China Department of Physics, The University of York, York, YO10 5 DD, United Kingdom Department...

Rotation of the pinning direction in the exchange bias training effect in polycrystalline NiFe/FeMn bilayers.

For polycrystalline NiFe/FeMn bilayers, we have observed and quantified the rotation of the pinning direction in the exchange bias training and recovery effects. During consecutive hysteresis loops, the rotation of the pinning direction strongly depends on the magnetization reversal mechanism of the ferromagnet layer. The interfacial uncompensated magnetic moment of antiferromagnetic grains may...

Establishing exchange bias below T-N with polycrystalline Ni0.52Co0.48O/Co bilayers

Positive exchange bias in FeF2-Fe bilayers.

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...