Out-of-plane exchange coupling between epitaxial Ni (50 Å) and NiO (600 Å) bilayers

Abstract

We have investigated the exchange coupling between an epitaxial Ni ͑50 Å͒ film with an out-of-plane magnetic easy axis and a NiO ͑600 Å͒ film by polar magneto-optic Kerr-effect measurements. The temperature dependences of exchange field H E for both as-deposited and field-cooled states exhibit the same blocking temperature T B ϳ130°C. The exchange field H E for the field-cooled state is lower than that for the as-deposited state. The hard-axis in-plane loop shows a much smaller value of H E . No coercivity enhancement is observed. The data are suggestive of linear coupling across the ferromagnet/antiferromagnet interface.

The metal/organic interface in cobalt/vinylidene fluoride heterostructures

“…in blue. We use the difference in Kerr signal intensity between up and down magnetic saturation for a given hysteresis loop (ΔI) normalized to the maximum intensity corresponding to a particular saturation state (I max ) as a measure of the quantity of ferromagnetic material 35 . Because MOKE does not measure the absolute magnetization, we cannot compare this quantity across samples.…”

Noncollinear interlayer coupling and its effect on exchange bias in Co(32Å)/NiO(tNiOÅ)/[Co(4Å)/Pt(6Å)]4/Pt(50Å) multilayers

“…It has been quite clear now that the exchange bias is strongly dependent on the spin configuration at the FM-AF interface, even though a theoretical model generally applies to a specific FM/AF system and is not valid for the other systems. In addition to the in-plane exchange bias which has been observed in the FM/AF systems with the in-plane anisotropy and has been investigated extensively, out-of-plane exchange bias has also been observed recently in FM/AF systems with the perpendicular anisotropy [6][7][8][9].…”

Effect of varying ferromagnetic anisotropy on exchange-bias in [Pt/Co]3/NiO(11Å) multilayers

“…the FM easy axis lies in-plane. Recently, perpendicular exchange bias has been observed in exchange-biased FM layers or multilayers with out-of-plane easy axis after fieldcooling along the sample normal [7][8][9]. For both in-plane and out-of-plane (perpendicular) exchange bias, previous studies have shown that the bias can be related to the interfacial spin configuration and domain structures in the AFM layer [7,[10][11][12][13].…”