Abstract
An investigation of the Y2Fe17 compound belonging to the class of intermetallic alloys of rare-earth and 3d-transition metals is presented. The magnetization, magnetostriction, and thermal expansion of the Y2Fe17 single crystal were studied. The forced magnetostriction and magnetostriction constants were investigated in the temperature range of the magnetic ordering close to the room temperature. The giant field induced volume magnetostriction was discovered in the room temperature region in the magnetic field up to 1.2 T. The contributions of both anisotropic single-ion and isotropic pair exchange interactions to the volume magnetostriction and magnetostriction constants were determined. The experimental results were interpreted within the framework of the Standard Theory of Magnetostriction and the Landau thermodynamic theory. It was found out that the giant values of the volume magnetostriction were caused by the strong dependence of the 3d-electron Coulomb charge repulsion on the deformations and width of the 3d-electron energy band.
Highlights
The magnetostriction is the occurrence of the mechanical deformation variations of magnetic samples due to the changes in the magnetization degree or in the magnetization direction
The first temperature region is close to the temperature of magnetic phase transition (TC),1 and the second one is significantly lower than TC in a strong magnetic field
The aim of this paper is to thoroughly investigate the magnetization, magnetostriction, and thermal expansion of the Y2Fe17 single crystal in the Curie temperature region and to determine the dependences of the magnetostriction on the magnetization, the magnetostriction constants on the temperature, and the value of exchange interaction on the unit cell volume
Summary
The magnetostriction is the occurrence of the mechanical deformation variations of magnetic samples due to the changes in the magnetization degree or in the magnetization direction. The microscopic origin of the magnetostriction involves the interaction of the orbital atomic moment with the electric charges in the crystalline lattice (the crystal field). The magnetostriction is observed when a magnetic field is applied to a magnetized sample; in this case, it is called forced magnetostriction.. The forced magnetostriction of intermetallic compounds of 3d-transition and rare-earth metals (REM) was investigated in two temperature regions. The first temperature region is close to the temperature of magnetic phase transition (TC), and the second one is significantly lower than TC in a strong magnetic field.. It is known that the forced magnetostriction is insignificant at low temperatures (T ( TC); it is large close to TC. The first temperature region is close to the temperature of magnetic phase transition (TC), and the second one is significantly lower than TC in a strong magnetic field. It is known that the forced magnetostriction is insignificant at low temperatures (T ( TC); it is large close to TC.
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