Magnetic properties and magnetostriction in TbFe2 compound with the addition of manganese or gallium

Abstract

In the present study magnetic and magnetostrictive properties of Tb(Fe1−xTx)2 (T=Mn, Ga) compounds were examined by magnetic measurement, Mössbauer, and x-ray study. Mössbauer study shows that the easy magnetization direction of the compounds may deviate slightly from the major axis of symmetry and the average isomer shift of the compounds decreases with increasing the x value, which was attributed to the charge transfer from 3d electrons of Mn atoms or 4p electrons of Ga atoms into the 3d band of Fe. It was also found from x-ray measurement that the spontaneous magnetostriction λ111 decreased due to Mn or Ga substitution, which can be understood on the basis of the single-ion model. The increase of the polycrystal magnetostriction λs due to Mn substitution was also found and can be ascribed to the increase of λ100, which may be caused by the filling of d bands due to substitution.

Investigation on the structural and magnetic properties of sputtered TbFe2/Fe3Ga heterostructures

“…These alloys have been poorly studied, although it has been reported that they can exhibit a pretty high magnetostriction of around 1000 ppm. 23 Thus, in the heterostructures with thin layers, the TbFe 2 cannot be crystallized because of the low Tb content in the Tb-Fe layers. Nevertheless, our experimental results indicate the presence of another potential magnetostrictive phase.…”

Large magnetocaloric effect in Laves phase TbMn 1.8 Fe 0.2 compound over a wide temperature range

“…For TbMn 2 , it shows a sharp PM-AFM transition at Neel temperature T N = 40 K [15], and TbFe 2 orders ferromagnetically at T C = 697 K with a Fe magnetic moment of 2.10 B [16]. Since the distance between the nearest Fe atoms in TbFe 2 (d Fe-Fe = 2.59Å) [17] is smaller than d Mn-Mn (2.70Å) [10] in TbMn 2 , the present TbMn 1.8 Fe 0.2 sample (d Mn-Mn = 2.69Å) lies much close to the critical value of d Mn-Mn = 2.66Å, below which Mn atoms would have no intrinsic magnetic moment [18]. Therefore, Fe substitution for Mn in TbMn 2 would induce a smaller 3d-3d distance and a rapid decay of the Mn magnetism.…”

Структурные, магнитные и тепловые свойства соединения Tb-=SUB=-0.8-=/SUB=-Sm-=SUB=-0.2-=/SUB=-Fe-=SUB=-2-=/SUB=- cо структурой фаз Лавеса

“…образуют важный в практическом отношении класс магнитных материалов, демонстрирующих высокие значения как спонтанной магнитострикции, так и магнитострикции, индуцированной внешним полем в широкой области температур, включая комнатную [1][2][3][4][5][6][7][8][9][10]. Наиболее известные среди них соединения TbFe 2 и SmFe 2 со структурой фаз Лавеса с гигантской магнитострикцией в области комнатных температур +1.7 · 10 −3 и −1.5 · 10 −3 , соответственно [11][12][13][14][15][16]. Сплавы имеют близкие по абсолютной величине значения магнитострикции, которые отличаются по знаку.…”