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

Abstract

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Visualizing hydrogen diffusion in magnetic film through magneto-optical Kerr effect

“…This was because Pd is a highly efficient catalyst for hydrogen molecule dissociation and Pd-hydride formation is energy favorable 2 . Based on these findings, we also observed appreciable magnetic modulation in Pd-rich magnetic alloy thin films, indicating that such materials would be useful in fabricating gas sensors and especially suitable for spatially resolved hydrogen diffusion 12,[18][19][20][21][22][23] . Moreover magneto-optical Kerr effect (MOKE), originating from the optical property and magnetism of materials, has long been widely applied in magnetic measurement of nanoscale samples because of the extremely high sensitivity and feasibility [24][25][26] .…”

“…Moreover magneto-optical Kerr effect (MOKE), originating from the optical property and magnetism of materials, has long been widely applied in magnetic measurement of nanoscale samples because of the extremely high sensitivity and feasibility [24][25][26] . In addition to the magneto-optical Kerr rotation and intensity, the intrinsic characteristics of magnetism such as the magnetic cercivity H c and the squareness M r /M s can be measured through this method 14,16,18,23,27,28 .…”

Magneto-optical study of anomalous magnetization reversal in the presence of anisotropy dispersion in CoPd thin films

“…CoPd thin films and multilayers have received interest because of perpendicular magnetic anisotropy [21], the observation of stable Néel skyrmions [22], applications in perpendicular magnetic tunnel junctions [23], hydrogen gas sensing, and other spintronic devices [24][25][26][27][28][29]. Despite many works on CoPd thin films, details on the in-plane anisotropy and its dependence on the Co:Pd ratio have not been reported.…”

Magneto‐Ionic Switching of Superparamagnetism

“…When hydrogen bonds to palladium, it partly transfers its charge to the Pd d‐band, effectively changing the electronic structure of the metal and thus the interaction distance of the RKKY function. Hydrogen‐induced changes of RKKY periodicity were reported earlier in studies of magnetic interlayer coupling in Fe/V [49] and Fe/Nb [50] multilayers and were proposed to account for the ordering in PdCo alloy films . On the other hand, Co clusters embedded at narrow distances in nonmagnetic matrices were found to form correlated magnetic “dimers,” i.e., physically separated but magnetically coupled entities .…”

“…Alloying metallic palladium with a defined amount of cobalt enables the preparation of alloys on the verge of ferromagnetism at room temperature, where a great sensitivity of the magnetic properties to small perturbations in the electronic structure is expected. Hitherto research groups investigated the tuning of magnetism in PdCo structures via (pseudo‐)capacitive double‐layer charging in electrolytic environments and upon gas‐phase hydrogenation . Besides, PdCo structures were proposed as hydrogen sensors based upon the strong effect of hydrogen on the magnetic properties …”