Magnetic susceptibility of the Pd–Co–H system

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

“…[1][2][3][4] In our previous studies, the combination of Pd with magnetic transition metals provided an opportunity to modulate the magnetism, because Pd is an efficient catalyst in the dissociation of hydrogen molecules and the presence of Pd atoms can also help to stabilize hydrogen bounding to transition metals. [5][6][7][8][9][10][11][12] The palladium-hydrogen system has attracted intensive research efforts in physical chemistry as a model system because of its high storage capacity, its high sensitivity and selectivity to H 2 gas, and its ability to easily release hydrogen at room temperature. 13 Our previous reports on the effect of hydrogenation on Pd/Fe, Co, and Ni bilayers showed the significant enhancement of the magnetooptical Kerr signal, but without any observable modification of the intrinsic magnetic properties, such as the shape of the magnetic hysteresis loop and magnetic coercivity.…”

“…This indicates that Pd-H bonding is stronger and more stable than the Co-H bonding in the alloy sample. 12 In the Co-Pd alloy, the large number of hydrogen boned by Pd will bring in more contact between the H and Co. The Pd-H and Co-H hydride formation unavoidably leads to charge transfer and the pronounced change of electronic structure accordingly.…”

Sensing hydrogen in the gas phase using ferromagnetic Pd–Co films

“…In a mixture of H 2 and N 2 , the values of DV satu were almost proportional to the square root of the H 2 concentration. At lower hydrogen contents, in the Pd-Co alloy with a Co concentration of 8 atom%, the magnetic susceptibility had a linear dependence on the hydrogen content [9]. As the hydrogen content in the Pd-Co alloys is proportional to the square root of the equilibrium pressure (Sievert's law), DV satu is proportional to the C H2 1/2 .…”

“…Recently, the magnetic susceptibilities of Pd alloys have been reported as a function of the hydrogen concentration in bulk [5][6][7][8][9]. In these Pd alloys, the Pd-Co alloys with Co concentrations above 8 atom% exhibited ferromagnetic behavior [10] and the magnetic susceptibility decreased significantly with the hydrogen concentration in the bulk [9]. The magnetic susceptibility of Pd-Co reflects the hydrogen concentration in the gas phase, because the hydrogen concentration in Pd-Co is converted to the equilibrium pressure of hydrogen at a constant temperature.…”

“…The magnetic susceptibility of Pd-Co reflects the hydrogen concentration in the gas phase, because the hydrogen concentration in Pd-Co is converted to the equilibrium pressure of hydrogen at a constant temperature. The magnetic susceptibility of the Pd-Co alloys respond to the hydrogen uptake, even at low equilibrium pressures (corresponding to the hydrogen dissolution region) [9]. Therefore, Pd-Co alloys are suitable materials for hydrogen-sensing devices that use magnetic susceptibility measurements.…”