Magnetic resonance microscope

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Magnetic resonance imaging of an onion (cross section)

A magnetic resonance microscope or MRM is a measurement technique that practically represents magnetic resonance tomography on a microscopic scale. It is used primarily in materials science . For the procedure itself, see magnetic resonance imaging. So be voxel -Auflösungen μm³ reached by the 100th

Sometimes the term “ magnetic microscope” is used for the method , although the term is misleading for the above method, since it does not represent the magnetic field emanating from the workpiece to be examined, but the radio waves emitted during nuclear magnetic resonance . The term is more suitable for the atomic force magnetic microscope described below or for techniques in which an image of the magnetic field is recorded directly (for example with Hall effect sensors).

Is similar to the scanning tunneling microscope directly, the magnetic field of the surface by means of SQUIDs (which the Josephson effect exploit) is scanned, it is called atomic force microscope magnet , MRFM or scanning magnetic microscope . This method is used to examine structures in the nanometer range or below, for example to examine semiconductor structures or proteins . The basics and theoretical possibilities were first described in 1991. The first MRFM image was recorded in 1993 at the IBM Almaden Research Center (image with 1 µm vertical and 5 µm horizontal resolution of the surface of a paramagnetic substance). A resolution in the nanometer range was achieved in 2003. The observation of the magnetic spin of a single electron was made in 2004.

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  1. ↑ J. A Sidles: Noninductive detection of single ‐ proton magnetic resonance . In: Applied Physics Letters . tape 58 , no. 24 , June 17, 1991, pp. 2854-2856 , doi : 10.1063 / 1.104757 .
  2. ↑ O. Züger, D. Rugar: First images from a magnetic resonance force microscope . In: Applied Physics Letters . tape 63 , no. November 18 , 1993, p. 2496-2498 , doi : 10.1063 / 1.110460 .
  3. ↑ Shih-hui Chao, William M. Dougherty, Joseph L. Garbini, John A. Sidles: Nanometer-scale magnetic resonance imaging . In: Review of Scientific Instruments . tape 75 , no. 5 , April 5, 2004, pp. 1175-1181 , doi : 10.1063 / 1.1666983 .
  4. ↑ D. Rugar, R. Budakian, HJ Mamin, BW Chui: Single spin detection by magnetic resonance force microscopy . In: Nature . tape 430 , no. 6997 , July 15, 2004, p. 329-332 , doi : 10.1038 / nature02658 .