Physics
Scientific paper
Dec 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982pepi...30..322r&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 30, Issue 4, p. 322-322.
Physics
Scientific paper
New measurements of high field magnetisation (Is), remanence (Is), and coercive force (Hc) are presented between 4 and 300 K for x = 0.4, 0.5, 0.6 and 0.8 (Fe3-xTixO4). For x = 0.4 a pronounced minimum is found at T⋍100 K and for x = 0.5 and 0.6 broad minima occur around T⋍200 K, apparently coinciding with the temperature for K1⋍0. The magnetic properties below T⋍60 K ar complex and were found to be significantly changed by cooling in the presence of a high magnetic field. With no applied field during cooling, a distinct decrease in Is is observed for T<~60 K, at which temperature there is a peak in the value of Irs. The effe cooling is to eliminate the sharp decrease in Is, reduce Hc and to increase Irs below ~60 K to a value the peak value, giving essentially a square hysteresis loop. The results are interpreted in terms of a form of crystallographic phase transition coupled to the magnetisation direction, possibly by the magnetostriction. Square hysteresis loops in ferrites have been explained by the presence of Jahn-Teller ions and, in the present case, the low temperature of the observed effect may be a consequence of the weak Fe2+ Jahn-Teller ion coupled to other effects such as spin-lattice coupling.
Details of this work can be found in Schmidbauer, E. and Readman, P.W., 1982. Low temperature magnetic properties of Ti-rich Fe-Ti spinels. J. Magn. Magn. Mat., 27: 114-118. A paper reporting further work on Fe2.4Ti0.6O0.4 is in preparation.
Readman Peter W.
Schmidbauer E.
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