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

Abstract

Sizeable magnetic circular dichroism of artificially precipitated Co clusters in amorphous carbon AIP Advances 2, 032142 (2012) Ferromagnetic properties of GdN thin films studied by temperature dependent circular polarized spectroscopy Appl. Phys. Lett. 101, 072403 (2012) Carrier-dopant exchange interactions in Mn-doped PbS colloidal quantum dots Appl. Phys. Lett. 101, 062410 (2012) Faraday rotation effect in periodic graphene structureThe hydrogenation induced change of magneto-optical Kerr effect (MOKE) was studied in n ML Pd/30 ML Fe bilayers on Al 2 O 3 (0001). With the increasing of Pd thickness from 3 ML to 60 ML, the MOKE extinction angle was gradually shifted by 0.6 and the enhancement of Kerr intensity reached 35%-40% after exposure to 1 atm hydrogen. The reversibility of this significant change was demonstrated by cyclic desorption and reabsorption of hydrogen. This study reveals the sensitive MO response in the combination of a magnetic Fe thin film with a highly hydrogenated Pd capping layer. V C 2012 American Institute of Physics. [http://dx.

Hydrogen-mediated long-range magnetic ordering in Pd-rich alloy film

“…14 In an annealed Pd/Co/Pd trilayer and a [Co/Pd] 12 multilayer, the hydrogenation induced modulation of the magnetism was observed clearly because of the enhanced interface effect. [15][16][17][18] Based on these findings, we expected to observe appreciable magnetic modulation in Pd-rich magnetic alloy thin film; such materials would be useful for fabricating gas sensors. [19][20][21] Thus, in this study, the effect of hydrogenation on the magnetic properties of Co 14 Pd 86 was investigated.…”

“…15 Figure 1 shows the measured perpendicular and in-plane MOKE hysteresis loops of the 14 nm Co 14 Pd 86 /Al 2 O 3 (0001) thin film. Observable hysteresis loops were obtained for both directions, suggesting a canted magnetization in the Co 14 Pd 86 alloy film.…”

“…The magnetic properties were measured at room temperature by using the magneto-optical Kerr effect (MOKE) in both perpendicular and in-plane geometry. 15,16 The MOKE chamber was either pumped to a vacuum of 5 Â 10 À3 mbar or filled with H 2 gas at various pressures to investigate the effect of hydrogenation on the magnetooptical and magnetic properties of Co 14 Pd 86 .…”

“…15,16 An analyzer, comprising a linear polarizer oriented at a small angle / from the s-axis and a photodiode, was used to detect the reflected beam. When a magnetic sample was used, the reflected beam was no longer purely p-polarized; instead, it comprised a p-component (E p ) and an s-component (E s ).…”

“…15,16 The alloy composition was calibrated using Auger electron spectroscopy. Atomic force microscopy was used to investigate the surface morphology.…”