Perpendicular magnetic anisotropy in TbFeCo films studied by magnetic Compton scattering

Abstract

Magnetic Compton profiles (MCPs) of TbFeCo amorphous films have been measured from a viewpoint of perpendicular magnetic anisotropy (PMA). Analysis of anisotropies of the MCPs has shown that anisotropies of wave functions are small in both a PMA film and an isotropic magnetization (IM) film. Element selective analysis of the MCPs has shown that a Tb magnetic moment and a magnetic moment of 3d transition metal (TM) are coupled antiparallel in the PMA film. In the case the IM film, the magnetic moment of 3d TM tends to align toward the magnetic field but the Tb magnetic moment distributed to random orientations. The PMA natures reflect the magnetic structures of the Tb magnetic moment and the 3d TM magnetic moment in the TbFeCo films.

Magnetic properties of co-sputtered Tb–Co2FeAl films with perpendicular anisotropy

“…The H C is related with the antiferromagnetic coupling between Tb 4f and Fe (Co) 3d electrons that is also an important factor for PMA [9]. The PMA of CFA originates from the coupling with perpendicularly magnetized amorphous (Tb, Co, Fe, and Al) phase [14], and the PMA of the amorphous alloy mainly comes from the antiparallel coupling between 3d TM and Tb magnetic moment and the Tb moment aligns toward magnetic field, which is evidenced by magnetic Compton scattering in TbCoFe films [15]. Therefore, the content of Tb must affect the strength of coupling in TCFA films.…”

Estimation of Angular Momentum Compensation Temperature in GdFe Film by Magnetic Compton Scattering

“…Furthermore, the contribution from the Gd 5d orbitals is negligibly small. Therefore, fitting free atom profiles to a high momentum line shape has been exploited to separate 4f contributions from 3d contributions in 4f rare earth-3d transition metal alloys 27) . The purple solid lines in Figs.…”

Magnetic characteristics of Tb x (FeCoV)100−x films

“…A large effort has been made to fabricate TbFe(Co) films with reduced coercivity and controlled the easy direction of magnetization by magnetron sputtering [3,4]. For Tb x Fe 100-x films, as x = 25-45, it produces perpendicular magnetic anisotropy (PMA), a large coercive field and a high saturation magnetization [5]. These properties can be controlled by adjusting the process parameters during sputtering such as working pressure and substrate temperature [6,7].…”