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

Abstract

Low dimensional materials of perpendicularly magnetized [Co(0.5 nm)/Pd(3 nm)] multilayer, including continuous thin film, nanodots and nanodot-chains were prepared for the investigation of reversible hydrogenation effect on the magnetic and optical properties. For the continuous film, after hydrogenation the magnetic coercivity (H c) was enhanced by 47% and the Kerr intensity was significantly reduced to 10% of the pristine value. In nanodots, hydrogenation led to 25% reduction of H c and Kerr intensity as well. For nanodot-chains, the shape of magnetic hysteresis loop was modulated by hydrogenation. The hydrogenation and desorption completed within few seconds in nanodots. V

Nanopatterning‐Enhanced Sensitivity and Response Time of Dynamic Palladium/Cobalt/Palladium Hydrogen Gas Sensors

“…A number of effects of hydrogenation on the magnetic properties of Pd/ferromagnetic layers and multilayers have been identified, opening pathways toward magnetic hydrogen gas sensors . In this study, we demonstrate an alternative fire‐safe, contactless hydrogen gas sensing method exploiting ferromagnetic films for data storage applications .…”

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.…”

“…In our previous study, [Co/Pd] 12 multilayer nano-dots exhibited a considerably fast hydrogenation response (within a few seconds), in contrast to the much longer response time of a [Co/Pd] 12 continuous film (2000-3000 s). 18 Figure 4 shows the reversibility of the hydrogenation effect on the magnetism of the Co 14 Pd 86 /Al 2 O 3 (0001) film. The MOKE measurement chamber was cyclically pumped to a vacuum and filled with 40 mbar H 2 gas, as indicated at the bottom (right axis) of Fig.…”

Microwave magnetic dynamics in ferromagnetic metallic nanostructures lacking inversion symmetry

“…[1][2][3][4][5][6][7][8][9][10][11][12]). These materials are important for the emerging fields of magnonics [13], microwave spintronics [14][15][16][17], and for novel sensor applications [18][19][20][21].…”

“…[1][2][3][4][5][6][7][8][9][10][11][12]). These materials are important for the emerging fields of magnonics [13], microwave spintronics [14][15][16][17], and for novel sensor applications [18][19][20][21].Macroscopically-long stripes with sub-micron cross-section made of ferromagnetic materials have attracted a lot of attention, because this geometry is a very convenient model object for studying the impact of geometric confinement on magnetization dynamics on the sub-micrometre and nanometer scales [22][23][24][25][26][27][28][29][30]. The main reasons for the attractiveness of this geometry are the practical absence of a static demagnetizing field H ds when the external field is applied along the stripes (i.e.…”