Double shifted magnetization curves in magnetic bilayers

Exchange coupling-induced uniaxial anisotropy in La0.7Sr0.3MnO3 thin films

“…Such double-shifted magnetization curves have already been studied by micromagnetic modeling, experimentally observed in some other magnetic bilayers, such as Co/ NiMn, and explained from the perspective of phenomenological theory to be the result of competition between uniaxial magnetic anisotropy and biaxial magnetic anisotropy [22]. In order to understand the M-H hysteresis behavior observed in our LSMO thin films, the S-W model was used to simulate the M-H hysteresis loops of the films.…”

“…According to the S-W model, a double-shifted magnetization curve appears only when the values of K u and K b meet a rigorous requirement of [22]. As shown in Fig.…”

Magnetization processes in ferromagnetic nanostructures with competing anisotropies

“…The perfectly soft case describes an anhysteretic transformation via equilibrium multidomain states [12]. For nanoscale ferromagnetic objects, only specific cases of magnetization curves in the Stoner-Wohlfarth limit have been analysed in detail [5]. However, evidence for multidomain states and incoherent spin rotations is found in various thin layered systems, e.g.…”

“…Hence, surfaces or couplings to suitable substrates may induce uniaxial anisotropy, and the coupling to an antiferromagnet may yield unidirectional anisotropy leading to exchange bias [4]. The interplay between these different types of anisotropies causes remarkable phenomena such as shifted and double-shifted hysteresis loops and multidomain states [4][5][6][7]. These effects are commonly described by including the heuristic Ne´el ansatz for surface anisotropies into the micromagnetic energy functional [5].…”

“…The interplay between these different types of anisotropies causes remarkable phenomena such as shifted and double-shifted hysteresis loops and multidomain states [4][5][6][7]. These effects are commonly described by including the heuristic Ne´el ansatz for surface anisotropies into the micromagnetic energy functional [5]. This model is valid only in the limit of sufficiently thick films.…”