Effects of internal stress on remanence intensity jumps across the Verwey transition for multi-domain magnetite

Details Effects of internal stress on remanence intensity jumps across the Verwey transition for multi-domain magnetite Effects of internal stress on remanence intensity jumps across the Verwey transition for multi-domain magnetite

Aug 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008pepi..169..100l&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 169, Issue 1-4, p. 100-107.

Physics

1

Scientific paper

The magnetic properties of magnetite (Fe3O4) are strongly dependent on the internal stress related to stress-controlled regions and to closure domains associated with defects. The contribution of internal stress to the low-temperature magnetic properties of magnetite was tested using annealed and unannealed multi-domain (MD) magnetites. During low-temperature cooling, a room temperature-induced saturation isothermal remanent magnetization (SIRM) increased abruptly at the Verwey transition (Tv ˜ 122 K). In particular, the absolute intensity jump (δVJ, defined as the jump in SIRM at Tv upon cooling) resulted from the high-coercivity fraction of MD grains. We observe that annealing significantly reduces internal stress and thus decreases the average microcoercivity. Comparison of the alternating field (AF) demagnetization spectra of δVJ both for annealed and unannealed magnetites directly links δVJ to the internal stress. It is likely that removal of the closure domain associated with stress-controlled regions was dominant when the peak AF was less than the average micromagnetic coercivity , resulting in a net increase of δVJ with increasing AF. However, when the AF exceeded the threshold, δVJ decreased because the stress-controlled regions were demagnetized. Such observations could therefore be useful for estimating the of MD magnetite.

Affiliated with

Also associated with

No associations

Rating

Effects of internal stress on remanence intensity jumps across the Verwey transition for multi-domain magnetite does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Effects of internal stress on remanence intensity jumps across the Verwey transition for multi-domain magnetite, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Effects of internal stress on remanence intensity jumps across the Verwey transition for multi-domain magnetite will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1807112