Perpendicular magnetic anisotropy in chemically disordered FePd–FeV(100) alloy thin films

Abstract

We find that the use of V͑100͒ buffer layers on MgO͑001͒ substrates for the epitaxy of FePd binary alloys yields to the formation at intermediate and high deposition temperatures of a FePd-FeV mixed phase due to strong V diffusion accompanied by a loss of layer continuity and strong increase of its mosaic spread. Contrary to what is usually found in this kind of systems, these mixed phase structures exhibit perpendicular magnetic anisotropy ͑PMA͒ which is not correlated with the presence of chemical order, almost totally absent in all the fabricated structures, even at deposition temperatures where it is usually obtained with other buffer layers. Thus the observed PMA can be ascribed to the V interdiffusion and the formation of a FeV alloy, being the global sample saturation magnetization also reduced.

Superparamagnetic bimetallic iron–palladium nanoalloy: synthesis and characterization

“…around 104 K up to liquid N 2 temperature owing to the role played by the domain boundary exchange interaction. The alloy residing in the fcc plane consists of alternating Fe and Pd atomic planes, similar to the tetragonal structure as reported earlier [29]. Pd being a 4d transition metal is non-ferromagnetic and does not exhibit a magnetic moment, but when alloyed with the ferromagnetic transition metals (e.g.…”

Plasma-induced magnetic patterning of FePd thin films without and with exchange bias

“…[14] With particular fabrication methods such as specific deposition geometries or use of buffer layers, UMA and/or weak PMA are found in some FePd and other Fe-based alloys even without long-range L1 0 ordering. [5,15,16] Capping of proper materials such as Pd on FePd has been demonstrated to induce specific interaction at the interface due to the anisotropy of FePd, [17,18] which we consider can be a potential means of magnetic engineering. In this study, we demonstrate an easy method that utilizes e-beam lithography and O 2or Ar-plasma treatment to magnetically pattern an FePd thin film with a surface Fe-oxide layer formed upon ambient exposure.…”