Magnetic properties of aluminum-substituted $R–T$ deuterides $Ho6(Fe,Al)23Dz$ Available to Purchase

The influence of deuteration on the magnetic properties of aluminum-substituted $R6Fe23−xAlxDz$ compounds (⁠$R=Ho,Y$⁠; $x=0,5$⁠; $z=10,16$⁠) has been investigated by magnetization measurements in the temperature range of $5–350K$ under a magnetic field of up to $90kOe$⁠. In comparison to the parent alloys, a large increase of the Fe magnetic moment $μFe$⁠, much larger in yttrium than in holmium compounds, is observed upon deuteration. The magnetic exchange coupling $NHo–Fe$ between the $R$ and Fe sublattices was estimated from the slope of the field-induced transitions of the magnetization $M$ isotherms in the vicinity of the compensation temperature $Tcomp$⁠. The values of $NHo–Fe$ and $Tcomp$ decrease with insertion of deuterium, indicating a weakening in $R–T$ coupling. The different results are analyzed within the frame of the Néel ferrimagnetic model taking into account the noncolinearity of the Ho and Fe sublattices magnetizations. The Ho–Ho and Fe–Fe magnetic interactions and the canting angle $θ(θ⪡10°)$ are then determined. In Al-substituted deuterides, the presence of the rare-earth Ho “stabilizes” the ferrimagnetism.