Perpendicular magnetic anisotropy at the Fe/Au(111) interface studied by Mössbauer, x-ray absorption, and photoemission spectroscopies

Mössbauer spectroscopy with polarized synchrotron beams at Fe/Au (111) interface

“…The Fe layer was grown at 150 °C on a clean Au surface using 56 Fe and enriched 57 Fe sources. The enriched 57 Fe was deposited only at the top layer to probe the interfacial layer because the bottom interface includes the strain introduced during the initial growth and top interface can be comparable with the previous MS measurements [23]. The Au layer was deposited onto the Fe layer at room temperature (RT).…”

“…3 Next, to elucidate the detailed magnetic characteristics, we conducted spectral fitting of the Mössbauer spectra. The broadened peaks were fitted by a single component, although two 1 types of components were adopted in the case of PMA for spectral fitting [23]. The Mössbauer parameters, the isomer shift (IS), QS, and H hf derived from the fitting for each spectrum in Fig.…”

“…Although SR-based MS can be employed for a layer-resolved discussion, there have been few studies on interfacial structures. In our recent report [23], SR-based MS for 3-monolayer (ML)-thick Fe on Au(111) with the PMA was performed. The interfacial proximity induced the enhancement of orbital magnetic moments at the interface, which is detected by not only MS but also X-ray magnetic circular dichroism spectroscopy and orbital-resolved ARPES with the band-structure calculations.…”

Origin of Perpendicular Magnetic Anisotropy in Co$_x$Fe$_{3-x}$O$_{4+δ}$ Thin Films Studied by X-ray Magnetic Circular and Linear Dichroisms

“…Assuming the value of ∆m orb to be 0.2 µ B , the PMA energy of Co can be estimated to be 1.6 × 10 6 J/m 3 with the assumption of the Co composition x=0.2 and strained CFO volume. The value of K from XMCD is overestimated compared with that from magnetization measurements, in general, by a pre-factor of 0.1 [63]. These estimations suggest that the PMA energy can be explained mainly by the contribution of small amount of anisotropic Co sites.…”

Chirality-Induced Noncollinear Magnetization and Asymmetric Domain-Wall Propagation in Hydrogenated CoPd Thin Films

“…39 The hysteresis loops in the top figures which can be attributed to the tetragonal L1 0 ordering in the CoPd alloy [51][52][53] even on the short-range scale, 53,54 and to the interfacial anisotropy or strain. [55][56][57][58][59][60] Oxidation diminishes PMA, 36 but hydrogenation afterward can enhance PMA with proper hydrogen concentrations. 47,[61][62][63][64][65] The perpendicular magnetization under in-plane fields after hydrogenation can be attributed to the PMA and the long-range coupling 46 The light rectangle in Fig.…”