Magnetic properties of aluminum-substituted R-T deuterides Ho6(Fe,Al)23Dz

Ostorero, J.; Guillot, M.

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Magnetic properties of aluminum-substituted R-T deuterides Ho₆(Fe,Al)₂₃D_z

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Guillot, M.
High Magnetic Field Laboratory, Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;

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Ostorero, J., & Guillot, M. (2007). Magnetic properties of aluminum-substituted R-T deuterides Ho₆(Fe,Al)₂₃D_z. Journal of Applied Physics, 101(9): 09C505.

Cite as: https://hdl.handle.net/21.11116/0000-000E-B42D-5

Abstract

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 5-350 K under a magnetic field of up to 90 kOe. In comparison to the parent alloys, a large increase of the Fe magnetic moment mu(Fe), 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 T-comp. The values of NHo-Fe and T-comp decrease with insertion of deuterium, indicating a weakening in R-T coupling. The different results are analyzed within the frame of the Neel 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 theta(theta < 10 degrees) are then determined. In Al-substituted deuterides, the presence of the rare-earth Ho "stabilizes" the ferrimagnetism.