The magnetostriction of Tb(Fe0.9MnxAl0.1−x)2 alloys

Abstract

Small amounts of Al and Mn were introduced to partly substitute for Fe in polycrystalline Terfenol alloy TbFe2 as Tb(Fe0.9MnxAl0.1−x)2(x=0–0.1). Their effects on structure, magnetic properties, magnetostriction, and hardness were studied. X-ray diffraction shows that the studied alloys remain cubic Laves phase. The saturation magnetization increases with Mn content. Curie temperature dramatically decreases with Mn addition and is further lowered due to the Al replacement. A magnetostriction of 1890 ppm at 19 kOe was obtained in the modified alloy x=0.06. Magnetostriction value at low field is distinctly greater, especially when x=0.04, than that of the TbFe2 or the Mn/Al. At 1 kOe, the magnetostriction of the x=0.04 alloy is 250 ppm compared to, 22 ppm in the base alloy. Addition of both Mn and Al improves the maximum value of dynamic strain coefficient d33(max) and lowers the corresponding field for Tb(Fe0.9MnxAl0.1−x)2 alloys as compared with the base alloy. When x=0.04, d33(max) is 360×10−9 Oe−1, 1.7 times higher than that of the base alloy, while the corresponding field is 0.562 kOe, 3.1 times lower than that of the base alloy.

Магнитная анизотропия в микропроводах TbFeB и PrDyFeCoB

“…Кубическая фаза Лавеса ReFe 2 , где Re -редкоземельные элементы, обычно проявляет гигантскую магнитострикцию при комнатной температуре из-за большого спин-орбитального взаимодействия между спином электрона и пространственно-анизотропным 4 f -электронным облаком [10]. Эта фаза в макроскопических образцах обычно обладает высокой магнитокристаллической анизотропией, что приводит к весьма высоким магнитным полям, необходимым для насыщения намагниченности и магнитострикции [10]. Магнитострикция насыщения фаз TbFe 3 , TbFe 2 , известных, как вариации терфенола, упоминается в литературе, как одна из самых высоких среди всех материалов [10].…”

“…Эта фаза в макроскопических образцах обычно обладает высокой магнитокристаллической анизотропией, что приводит к весьма высоким магнитным полям, необходимым для насыщения намагниченности и магнитострикции [10]. Магнитострикция насыщения фаз TbFe 3 , TbFe 2 , известных, как вариации терфенола, упоминается в литературе, как одна из самых высоких среди всех материалов [10]. В работе [12] были исследованы наночастицы TbFeB размерами от 8 до 80 nm.…”

Magnetic anisotropy in TbFeB and PrDyFeCoB microwires

“…Cubic Laves phase ReFe 2 , where Reare rare earth elements, generally shows huge magnetostriction at room temperature due to strong spin-orbital interaction between the electron spin and spatially-anisotropic 4 f -electron cloud [10]. This phase in macroscopic specimens generally has high magnetocrystalline anisotropy leading to rather high magnetic fields required for magnetization saturation and magnetostriction [10]. Saturation magnetostriction of TbFe 3 , TbFe 2 phases known as intermetallide variations is referred in literature as one of the highest among all materials [10].…”

“…This phase in macroscopic specimens generally has high magnetocrystalline anisotropy leading to rather high magnetic fields required for magnetization saturation and magnetostriction [10]. Saturation magnetostriction of TbFe 3 , TbFe 2 phases known as intermetallide variations is referred in literature as one of the highest among all materials [10].…”

Structure, Curie temperature, and magnetostriction of SmZn1−xMnx alloys

“…Figure 5 shows the magnetostriction ͑ ʈ -Ќ ͒ of SmZn 1−x Mn x alloys in a varying applied field at 77 K. It is found that the magnetostriction value increases with increasing Mn content in the range of 0 ഛ x ഛ 0.15. However, Shih et al 14 have found that a small amount of Mn can increase both the low magnetic field magnetostriction and the maximum dynamic strain coefficient for the Tb͑Fe, Al͒ 2 compounds. However, Shih et al 14 have found that a small amount of Mn can increase both the low magnetic field magnetostriction and the maximum dynamic strain coefficient for the Tb͑Fe, Al͒ 2 compounds.…”