Tailoring magnetism of multifunctional MnxGa films with giant perpendicular anisotropy

Abstract

We report wide-range composition and annealing effects on magnetic properties of Mn x Ga films grown on GaAs (001) by molecular-beam epitaxy. We obtained single-crystalline Mn x Ga films in a surprisingly wide composition range from x=0.76 to 2.6. We show that the magnetism could be effectively tailored by adjusting composition and annealing. Especially, when 0.76≤x≤1.75, Mn x Ga films simultaneously show magnetization from 130 to 450 emu/cc, perpendicular anisotropy among 8.6 to 21 Merg/cc, intrinsic coercivity from 4.38 to 20.1 kOe, normal coercivity up to 3.6 kOe, energy product up to 3.4 MGOe and thermal-stability up to at least 350 o C in contact with GaAs.

Formation and magnetic properties of the L10 phase in bulk, powder and hot compacted Mn–Ga alloys

“…The values of the measured saturation magnetisation as well as the calculated anisotropy constant are summarised in Table 2. The trend of the magnetisation stands in good accordance to the reported values for thin films as well as melt spun ribbons [10,25,26]. Also values of the anisotropy field are comparable to reported thin film measurements [14,26].…”

“…The trend of the magnetisation stands in good accordance to the reported values for thin films as well as melt spun ribbons [10,25,26]. Also values of the anisotropy field are comparable to reported thin film measurements [14,26]. The variation in the anisotropy field with composition is due to the changes in the saturation magnetisation and the anisotropy constant.…”

Anomalous Hall effect and spin-orbit torques in MnGa/IrMn films: Modification from strong spin Hall effect of the antiferromagnet

“…Here the Mn/Ga atoms ratio is 1 [38]. Then, IrMn films with different thickness were immediately deposited on it by dc magnetron sputtering.…”

Structural and Magnetic Properties of Fe Doped Mn-Ga Ribbons

“…It combines low magnetic moment with high Curie temperature and high spin polarization [9]. The reduction of the Mn content of the material towards Mn 2 Ga or with even less Mn content has also been studied [8,[10][11][12]. These alloys also present frustrated and structure/stoichiometry sensitive magnetic properties.…”