Anomalous thermal expansion and magnetic properties of Tm2Fe17-xCrx compounds
Abstract
The structural and magnetic properties of Tm2Fe17-xCrx (x =0, 0.5, 1.0, 1.5, and 2.0) compounds are investigated by means of x-ray diffraction and magnetization measurements. The Tm2Fe17-xCrx compounds have a hexagonal Th2Zi17-type structure. There exist a negative thermal expansion coefficient for Tm2Fe17-xCrx compounds near their Curie temperature and an anisotropic and strong spontaneous magnetostriction in the magnetic states of Tm2Fe17-xCrx compounds. In Tm2Fe17-xCrx compounds, Cr atoms substituting for Fe atoms can increase obviously the Curie temperature and the easy-axis magnetocrystalline anisotropy. The Curie temperature of Tm2Fe16Cr compound is about 160 K higher than that of the mother compound Tm2Fe17. The saturation magnetization of Tm2Fe17-xCrx compounds decreases with increasing Cr content.
- Publication:
-
Journal of Applied Physics
- Pub Date:
- July 2010
- DOI:
- Bibcode:
- 2010JAP...108b3915H
- Keywords:
-
- chromium alloys;
- Curie temperature;
- iron alloys;
- magnetic anisotropy;
- magnetisation;
- magnetostriction;
- thermal expansion;
- thulium alloys;
- X-ray diffraction;
- 65.40.De;
- 75.60.Ej;
- 75.80.+q;
- 75.30.Kz;
- 75.30.Gw;
- Thermal expansion;
- thermomechanical effects;
- Magnetization curves hysteresis Barkhausen and related effects;
- Magnetomechanical and magnetoelectric effects magnetostriction;
- Magnetic phase boundaries;
- Magnetic anisotropy