Abstract
The magnetic properties of the non-stoichiometric Tm2Fe16 compound under hydrostatic pressures up to 1 GPa were studied. We have revealed that the high-temperature ferrimagnetic state easily magnetized in the basal plane is very sensitive to the volume changes and even moderate pressure is sufficient to its complete suppression and transformation to a helimagnetic state. At the same time, the low-temperature ferrimagnetic state easily magnetized along the hexagonal axis does not disappear under pressure and the temperature of its transition to the high-temperature magnetic states increases under pressure. The remarkable stability of the ground ferrimagnetic state under external pressure can be attributed to the strengthening of the uniaxial magnetic anisotropy and to the mutual perpendicular orientation of the magnetic moments in the ground and the high-temperature magnetic states.
Highlights
The majority of R2Fe17 intermetallics (R = rare earth or Y) exhibit a collinear ferro- or ferrimagnetic arrangement of magnetic moments depending on the presence of the light- or heavy-R element, respectively
The drastic rise of M(T) at T ~ 90 K is a result of the well-known spontaneous spin-reorientation magnetic phase transition from the hexagonal axis to the basal plane
The ground ferrimagnetic state magnetized along the c-axis and the high-temperature helimagnetic state exist under all pressures applied
Summary
Tm2Fe17 is a collinear ferrimagnet below the transition temperature ΘТ [1, 4]. Unlike Ce2Fe17 and Lu2Fe17, Tm2Fe17 is characterized by a spontaneous spinreorientation transition at Tsr due to the competition between the uniaxial anisotropy of the Tm-subsystem and the planar-type anisotropy of the Fe-subsystem [4]. Both the Tm and Fe magnetic moments in Tm2Fe17 orient perpendicular to the hexagonal c-axis between the magnetic ordering temperature TN and Tsr, and they are parallel to this axis below Tsr
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