Influence of magnetic anisotropy on hysteresis behavior in the two-spin model of a ferro/antiferromagnet bilayer with exchange bias

Abstract

The influence of magnetic anisotropy of ferromagnetic film on the phenomenon of exchange bias is studied. Hysteresis behavior in the two-spin model of a ferro/antiferromagnet (FM/AFM) bilayer with exchange bias has been investigated in detail. In this model a half-space of AFM with fixed magnetic configuration contacts with a two-layer FM film. Twelve different types of magnetization curves M(H) (both with and without hysteresis) have been found. Some of the M(H) curves demonstrate unusual features, such as plateaus and inclined segments. The hysteresis loop becomes asymmetric if the surface anisotropy is taken into account.

Effect of the exchange bias on the magnetization hysteresis of a ferromagnetic film in contact with an antiferromagnet

“…For thin films with L ( l 0 at point A, (9) and (11), the above dependences L/l 1 $ J 0 /J on the field h are similar to those for the FM film consisting of two magnetic layers as discussed in Ref. 16 (see Fig. 4 in Ref.…”

“…There is no anticollinear phase, which has been discussed in Ref. 16, in the long-wavelength approximation used below.…”

“…16 for a system where the FM film consisted of only two atomic layers. In particular, the dependences of the bifurcation fields on the exchange across the interface, Eqs.…”

“…3(a)) considered in Ref. 16 as the starting point, then, when the anisotropy is taken into account, the transformation of the field dependence of the magnetization has the following form. The bifurcation points from the ground state with u ¼ 0 shift to larger negative values of the field and those from the state with u ¼ p shift towards smaller negative values of the field by the same amount DH 6 ¼ 7b.…”

Exchange bias phenomenon in (Nd1−xYx)2/3Ca1/3MnO3 (x = 0, 0.1) perovskites

“…As a general theoretical approach to the description of the phenomenon, theoretical models of the EB in AFM single crystals with the perfect [18][19][20] and imperfect 21,22 boundaries have been developed. Later, more sophisticated theoretical models, applicable to the description of the EB in polycrystalline AFM FM samples with spontaneous phase separation have also been proposed.…”