Changing the three-dimensional magnetization exchange coupling of mixed Fe and V nanoclusters with hydrogen

Abstract

The magneto-optical Kerr effect of an iron-vanadium nanocluster-assembled thin film was measured as a function of hydrogen content. Hydrogen has a clear effect on the magnetization of this three-dimensional exchange coupled system for both increasing and decreasing hydrogen pressures. This effect is attributed to the modification of the electronic properties of the nonmagnetic vanadium nanoclusters by hydrogen. Since vanadium mediates the exchange coupling between aggregated iron nanoclusters, the changes in magnetic properties are directly related to hydrogen absorption.

Critical hydrogenation effect on magnetic coercivity of perpendicularly magnetized Co/Pd multilayer nanostructures

“…[4][5][6][7][8][9] Palladium (Pd) has long been used as a highly efficient catalyst for hydrogen dissociation and absorption. 4,[10][11][12][13][14][15] Thin Pd films with a thickness of a few nanometers are widely used in metal-hydride systems. 8 Many studies have investigated various Pd alloys, multilayers, and nanostructures for determining the effects of hydrogenation.…”

Hydrogenation induced reversible modulation of perpendicular magnetic coercivity in Pd/Co/Pd films

“…2 Pd is usually used as a catalyst for hydrogen dissociation and absorption. [2][3][4][5][6] In the initial stage, H atoms occupy the interstitial sites of the Pd crystalline lattice (a phase). With increasing hydrogen absorption, the Pd lattice is expanded by 2-3% (b phase).…”

Hydrogenation-induced change of magneto optical Kerr effect in Pd/Fe bilayers

“…The variation of u min causes the horizontal shift of the linear function Eq. (5). As shown in the lower panel of Fig.…”

“…The consistence between the experimental data and the solid fitting line proves the linear relation in Eq. (5). In convectional MOKE hysteresis loop measurement, the analyzer is fixed at a small angle u from the s axis.…”

“…[1][2][3][4][5] After adsorption on Pd surface, a hydrogen molecule dissociates into two hydrogen atoms and then diffuses into the volume of Pd. With increasing hydrogen absorption, H atoms not only occupy the interstitial sites of the Pd crystalline lattice (a phase) but also expand the Pd lattice up to 2%-3% (b phase).…”