Origin of self-reversed thermoremanent magnetization

Harrison, R. J. and Kasama, T. and White, T. A. and Simpson, E. T. and Dunin-Borkowski, R. E. (2005) Origin of self-reversed thermoremanent magnetization. Physical Review Letters, 95 (26). p. 268501. DOI 10.1103/PhysRevLett.95.268501

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Abstract

The ability of certain magnetic minerals to acquire a remanent magnetization that opposes the direction of the Earth’s magnetic field has fascinated rock magnetists since its discovery in 1951. Here, we determine the origin of this phenomenon, which is termed self-reversed thermoremanent magnetization (SR-TRM). We present direct transmission electron microscopy observations of negative exchange coupling across antiphase domain boundaries (APBs) in ilmenite-hematite. This coupling is linked intrinsically to the origin of SR-TRM and is responsible for the formation of two new classes of magnetic domain wall at APBs. We present simulations of the chemical and magnetic structure of the APBs and show that SR-TRM is generated by coupling between strongly ferrimagnetic Ti-rich domains and weakly ferrimagnetic Fe-rich domains, which form during the transition from short- to long-range cation order.

Item Type:	Article
Uncontrolled Keywords:	2006 AREP IA50 2005 P
Subjects:	03 - Mineral Sciences
Divisions:	03 - Mineral Sciences
Journal or Publication Title:	Physical Review Letters
Volume:	95
Page Range:	p. 268501
Identification Number:	10.1103/PhysRevLett.95.268501
Depositing User:	Sarah Humbert
Date Deposited:	28 Apr 2011 16:30
Last Modified:	23 Jul 2013 09:58
URI:	http://eprints.esc.cam.ac.uk/id/eprint/1669

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