Physics – Condensed Matter – Materials Science
Scientific paper
2005-04-26
Phys. Rev. B 72, 012408 (2005).
Physics
Condensed Matter
Materials Science
16 pages, 3 figures, to appear in PRB
Scientific paper
10.1103/PhysRevB.72.012408
Exchange biased Ni/ FeF2 films have been investigated using vector coil vibrating sample magnetometry as a function of the cooling field strength H_FC. In films with epitaxial FeF2, a loop bifurcation develops with increasing H_FC as it divides into two sub-loops shifted oppositely from zero field by the same amount. The positively biased sub-loop grows in size with H_FC until only a single positively shifted loop is found. Throughout this process, the negative/positive (sub)loop shift has maintained the same discrete value. This is in sharp contrast to films with twinned FeF2 where the exchange field gradually changes with increasing H_FC. The transverse magnetization shows clear correlations with the longitudinal sub-loops. Interestingly, over 85% of the Ni reverses its magnetization by rotation, either in one step or through two successive rotations. These results are due to the single crystal nature of the antiferromagnetic FeF2, which breaks down into two opposite regions of large domains.
Arenholz Elke
Batlle Xavier
Li Zhi-Pan
Liu Kaijian
Morales Rafael
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