TY - JOUR
T1 - Spin glass phenomena in TbFexAl12-x
AU - Felner, I.
AU - Nowik, I.
PY - 1988/8
Y1 - 1988/8
N2 - Magnetization and 57Fe Mössbauer spectroscopy measurements of TbFexAl12-x (x = 3.5,4,4.5,5,5.5,6) at temperatures 4.2 to 350 K have been performed. The Mössbauer studies yield the iron relative occupation of the three, (f), (j) and (i), inequivalent crystallographic sites in the tetragonal (I4/mmm) unit cell, their hyperfine field distributions and the magnetic ordering temperatures. These are quite similar to those previously reported for YFexAl12-x. The magnetization measurements, however, display quite different phenomena than those observed for YFexAl12-x. The contribution of the Tb sublattice to the magnetization with its associated high magnetic anisotropy and the spin glass structure in the iron sublattices lead to the wide variety of unusual phenomena observed. These include: negative magnetization at low temperature when the sample is cooled in a magnetic field (TbFe5Al7). Three maxima in the magnetization temperature dependence of TbFe4.5Al7.5. Differences in magnetization curves depending on cooling rates. The more common phenomena associated with the spin glass structure, namely, differences between field cooled and zero field cooled magnetization curves, thermoremanent and isothermal remanent magnetization and their time dependences were also observed.
AB - Magnetization and 57Fe Mössbauer spectroscopy measurements of TbFexAl12-x (x = 3.5,4,4.5,5,5.5,6) at temperatures 4.2 to 350 K have been performed. The Mössbauer studies yield the iron relative occupation of the three, (f), (j) and (i), inequivalent crystallographic sites in the tetragonal (I4/mmm) unit cell, their hyperfine field distributions and the magnetic ordering temperatures. These are quite similar to those previously reported for YFexAl12-x. The magnetization measurements, however, display quite different phenomena than those observed for YFexAl12-x. The contribution of the Tb sublattice to the magnetization with its associated high magnetic anisotropy and the spin glass structure in the iron sublattices lead to the wide variety of unusual phenomena observed. These include: negative magnetization at low temperature when the sample is cooled in a magnetic field (TbFe5Al7). Three maxima in the magnetization temperature dependence of TbFe4.5Al7.5. Differences in magnetization curves depending on cooling rates. The more common phenomena associated with the spin glass structure, namely, differences between field cooled and zero field cooled magnetization curves, thermoremanent and isothermal remanent magnetization and their time dependences were also observed.
UR - http://www.scopus.com/inward/record.url?scp=0024057184&partnerID=8YFLogxK
U2 - 10.1016/0304-8853(88)90146-1
DO - 10.1016/0304-8853(88)90146-1
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AN - SCOPUS:0024057184
SN - 0304-8853
VL - 74
SP - 31
EP - 38
JO - Journal of Magnetism and Magnetic Materials
JF - Journal of Magnetism and Magnetic Materials
IS - 1
ER -