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Magnetic resonance diffraction using the magnetic field from a ferromagnetic sphere

Barbic, Mladen (2002) Magnetic resonance diffraction using the magnetic field from a ferromagnetic sphere. Journal of Applied Physics, 91 (12). pp. 9987-9994. ISSN 0021-8979. doi:10.1063/1.1480466.

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The theory of magnetic resonance diffraction is developed for the case of a crystal in close proximity of a ferromagnetic sphere. Distinct spectral peaks in the magnetic resonance signal are discovered for the specific ferromagnetic sphere and magnetic field configurations, and the appearance of the peaks is a direct signature of the presence of discrete atomic sites in the crystal lattice. The positions of the spectral peaks are sensitive to the crystal unit-cell size, thereby providing a method for determination of the basic parameters of the crystal at the atomic scale. The appearance of the spectral peaks is explained, and the dependence of the magnetic resonance spectra on the sphere size and the angle of the sphere magnetization with respect to the sample surface is analyzed. Applications to the studies of crystals, thin films, and crystallites are reviewed, and potential measurement methods for the confirmation of the diffraction theory are proposed. The analysis suggests that the long-desired goal of detecting atomic resolution magnetic resonance diffraction is well within reach of current experimental techniques.

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Additional Information:©2002 American Institute of Physics. (Received 4 January 2002; accepted 2 April 2002) This work was made possible by the unconditional support and financial assistance of Professor Axel Scherer of California Institute of Technology. The author also thanks Willie Padilla and David Schurig of University of California-San Diego for computational help, and Joyce Wong for careful reading of the manuscript. Part of this work was conducted while the author was with the Department of Physics, University of California-San Diego.
Subject Keywords:ferromagnetism; NMR imaging; crystallography; magnetisation; thin films; crystallites
Issue or Number:12
Record Number:CaltechAUTHORS:BARjap02a
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:1961
Deposited By: Archive Administrator
Deposited On:27 Feb 2006
Last Modified:08 Nov 2021 19:43

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