Spin glass phenomena in TbFexAl12-x

I. Felner*, I. Nowik

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

26 Scopus citations

Abstract

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.

Original languageEnglish
Pages (from-to)31-38
Number of pages8
JournalJournal of Magnetism and Magnetic Materials
Volume74
Issue number1
DOIs
StatePublished - Aug 1988

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