Determination of the easy axis of magnetization in terbium-yttrium iron garnet Tb1Y2Fe5O12 at low temperatures

作者：Lahoubi, Mahieddine^*; Wang, Wei; Pu, Shengli

来源：Physica B: Condensed Matter , 2015, 476: 129-131.

DOI：10.1016/j.physb.2015.03.008

• Terbium-yttrium iron garnet
• Ferrimagnetism
• High field magnetization
• Magnetic phase transition
• Magnetic anisotropy

Experimental investigations have been carried out on a spherical single crystal of terbium yttrium iron garnet (Tb1Y2Fe5O12) by means of magnetization measurements in strong dc magnetic fields up to 200 kOe applied along the < 111 >, < 110 > and < 100 > crystallographic directions at low temperatures (T < 20 K) with a high degree of resolution both in field and temperature. The strong anisotropic magnetic behavior which appears at 4.2 K is due to the competition between < 111 > and < 100 > directions to be the easy axis of spontaneous magnetization while the < 110 > clirection remains the more difficult axis. The magnetization measurement at 4.2 K leaving the sample to rotate freely on itself suggests that the easy axis of spontaneous magnetization is along the < 100 > direction. However, due to the magnetic anisotropy energies associated vvith both < 100 > and <111 > directions which are close to each other, the phase <111 > becomes more stable as soon as the magnetic field exceeds 10 kOe or the temperature is higher than 10 K. The results are compared vvith previous works.

• 出版日期2015-11-1
• 单位上海理工大学; 北京化工大学