Exchange anisotropy between single twin domain NiO and NiFe

Abstract

Single-twin (T)-domain NiO films were obtained by stress induced during the growth, and the exchange anisotropy between NiO and NiFe films was studied by using micromagnetic modeling. The compressive strain along the [111] is −7.16×10−4, which forces spins of NiO to lie on the (111) plane parallel to the film surface. The neutron diffraction shows that the moments of NiO predominantly lie in the film plane with random orientations, that is, the NiO is of a single T-domain, and multi-spin-rotation-domains in the film plane. The effective crystalline anisotropy of (111) NiO, calculated from micromagnetic modeling, is 2.4×104 ergs/cm3. The majority of NiO moments at the interface switched along with NiFe moments due to the low effective anisotropy, leading to a large coercivity and a low exchange field.

Surface morphology of pulsed laser deposited YBa2Cu3O7-δand NdBa2Cu3O7-δthin films on SrTiO3substrates

“…The maximum excursion registered in the 1×1 µm 2 AFM image, reported in figure 8(b), is only 6.4 nm, corresponding to 5-6 NBCO uc. The islands are not so defined as those reported by other groups for NBCO pulsed laser deposited films using a stoichiometric target [33,34]. The height of the island steps is about 1 NBCO uc.…”

Impact of interface orientation on magnetic coupling in highly ordered systems: A case study of the low-indexedFe3O4/NiOinterfaces

“…Indeed, Kurosawa et al 54 reported an extremely low value for well-annealed single crystals of only 29.5 J m −3 . Our experimental situation, however, may be more compatible with a layer coupled to a single crystal as, e.g., reported by Lai et al 4 for NiO͑111͒/ NiFe. In this case, a considerably higher value of 1360 J m −3 was found for the NiO anisotropy within the ͑111͒ plane, which might be more realistic due to the interaction with the coupled layer.…”