Magnetization of iron hydride

Electronic and magnetic properties of iron hydride under pressure: An experimental and computational study using x-ray absorption spectroscopy and x-ray magnetic circular dichroism at the Fe K edge

“…All the changes observed between the experimental spectra at P < 2.7 GPa and at P > 4 GPa are also observed between the calculated spectra for bcc-Fe and dhcp-FeH. This confirms that hydrogen can be absorbed into the iron lattice by application of pressure under an H 2 atmosphere, as was previously shown [4,5].…”

“…To confirm the nature of the transition, we performed calculations of the XAS and XMCD spectra of dhcp-FeH. At P = 3 GPa, the selfconsistent calculation converges to a ferromagnetic structure with a total magnetization of 2.2 μB per Fe atom, which is consistent with the magnetometry experiments [4] while previous DFT calculations underestimated it to around 1.9 μB per Fe atom [26,31]. The calculated spectra, which are depicted in the right panel of Fig.…”

“…Iron hydride FeH can be synthesized by application of a 3.5 GPa pressure on Fe in a H 2 environment [4,5]. We have investigated the transition from bcc-Fe to FeH and the effect of pressure on FeH up to 28 GPa using a combination of x-ray absorption spectroscopy (XAS) and x-ray magnetic circular dichroism (XMCD) (which is the difference between the absorption of left and right circularly polarized x rays for materials with a net magnetic moment) [6].…”

First-Principles Study on the Structural and Magnetic Properties of Iron Hydride

“…11,12) FeH keeps its composition and ferromagnetism even after releasing H pressure at low temperature. 13,14) Furthermore, FeH with hcp Fe framework has also been found as an intermediate state in the path of transformation from -Fe to dhcp FeH at relatively high pressures and elevated temperatures. 15) Thus, dhcp FeH can be considered as a thermodynamically stable phase at high pressures, and hcp FeH x is deemed to be a metastable phase.…”

Ultrahigh-pressure study on the magnetic state of iron hydride using an energy domain synchrotron radiation 57Fe Mössbauer spectrometer

“…Since the dissolution of hydrogen into metal under high pressure gives rise to some remarkable changes in physical properties. Compared to pure iron, iron hydride shows some unique physical properties [1,[3][4][5][6][7][8][9]. The formed dhcp structure is stable up to at least 80 GPa in room temperature [2].…”