Magnetostriction and hysteresis of (Tb 0.36 Dy 0.64 ) 1-x Ho x Fe 1.95 alloys

Abstract

The crystal structure, lattice constant, Curie temperatures, spin reorientation temperature, magnetization, magnetocrystalline anisotropy constant and magnetostriction of (Tb 0.36 Dy 0.64 ) 1-x Ho x Fe 2 (x=0.1, 0.2, 0.3) alloys were investigated. X-ray diffraction patterns demonstrate all the (Tb 0.36 Dy 0.64 ) 1-x Ho x Fe 2 alloys possess MgCu 2 -type cubic Laves structure. The Curie temperature T c of (Tb 0.36 Dy 0.64 ) 1-x Ho x Fe 1.95 alloys decreases slightly from 387 o C for Tb 0.36 Dy 0.64 Fe 2 to 379ºC for x=0.1, 375ºC for x=0.2 and 362ºC for x=0.3. The spin reorientation temperature T r increases from -94.1ºC for Tb 0.36 Dy 0.64 Fe 2 to -57ºC for x=0.1 and -51ºC for x=0.2. The magnetocrystalline anisotropy coefficient K 1 of (Tb 0.36 Dy 0.64 ) 1-x Ho x Fe 2 alloys decreases with increasing Ho concentration. The magnetostriction of (Tb 0.36 Dy 0.64 ) 1-x Ho x Fe 1.95 alloys was examined under applied magnetic field H (0<H<350 mT) in the temperature range from -60ºC to 80ºC. The (Tb 0.36 Dy 0.64 ) 1-x Ho x Fe 2 alloys (x≤0.2) have the character of giant magnetostrictive in a wide operating temperature range from -60ºC to 80ºC. The hysteresis of magnetostriction versus the applied field was reduced due to the addition of Ho concentration. Small amounts of Ho (x≤0.2) replacing Tb and Dy in the (Tb 0.36 Dy 0.64 ) 1-x Ho x Fe 2 formulation provide a much larger decrease in hysteresis losses with relatively small changes of magnetostriction in wide operating temperature range between -60ºC and 80ºC at magnetic field of 100mT.

Magnetic, magetostrictive properties, spin reorientation and Mössbauer effect of Tb0.3Dy0.7−x Pr x (Fe0.9Al0.1)1.95 alloys

“…Many research works have focused on substituting Fe with other elements in attempt to improve the magnetic and magnetostrictive properties in the Tb 0.3 Dy 0.7 (Fe 1−x T x ) 2 (T = Mn, Co, Ni, Ga, Al, B, Be, etc. ) alloys [2][3][4][5] in order to improve its application properties.…”

“…Many research works have focused on substituting Fe with other elements in attempt to improve the magnetic and magnetostrictive properties in the Tb 0.3 Dy 0.7 (Fe 1−x T x ) 2 (T = Mn, Co, Ni, Ga, Al, B, Be, etc. ) alloys [2][3][4][5] in order to improve its application properties.Based on these researches, Al is regarded as an ideal substitution for Fe. The application properties of Tb 0.3 Dy 0.7 (Fe 0.9 Al 0.1 ) 1.95 alloys are excellent [5][6][7][8] because the addition of Al to Fe increases resistivity and ductility and decreases anisotropy, but it is saturated magnetostriction that greatly decreases.…”

A study of magnetostriction, spin reorientation, and Mössbauer spectra of Tb0.3Dy0.6Pr0.1(Fe1−x Al x )1.95 alloys with substitution of Fe by Al

“…The application properties of Tb 0.3 Dy 0.7 (Fe 0.9 Al 0.1 ) 1.95 alloys turn out excellent [5][6][7][8][9] because the addition of Al to Fe increases resistivity and ductility and decreases anisotropy, but its saturated magnetostriction greatly decreases. On the basis of retaining the good application properties, we anticipate that substitution of other elements for Tb or Dy enhances the saturated magnetostriction of Tb 0.3 Dy 0.7 (Fe 0.9 Al 0.1 ) 1.95 alloys.…”

“…Many research works have focused on substituting Fe with other elements in an attempt to improve the magnetic and magnetostrictive properties in the Tb 0.3 Dy 0.7 (Fe 1−x T x ) 2 (T= Mn, Co, Ni, Ga, Al, B, Be, etc. ) alloys [2][3][4][5] and also to improve its application properties.Judging by these research reports, Al is regarded as an ideal substitution for Fe. The application properties of Tb 0.3 Dy 0.7 (Fe 0.9 Al 0.1 ) 1.95 alloys turn out excellent [5-9] because the addition of Al to Fe increases resistivity and ductility and decreases anisotropy, but its saturated magnetostriction greatly decreases.…”

“…Many research works have focused on substituting Fe with other elements in an attempt to improve the magnetic and magnetostrictive properties in the Tb 0.3 Dy 0.7 (Fe 1−x T x ) 2 (T= Mn, Co, Ni, Ga, Al, B, Be, etc. ) alloys [2][3][4][5] and also to improve its application properties.…”