Nuclear Magnetic Relaxation in Magnetite

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概要

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• The nuclear magnetic relaxation times in Fe_30_4 have been measured. The experimental values of T_1 and T_2 range from 1.4sec to 0.4ms between 4.2°and 300°K. For the A ion, T_1 and T_2 are roughly eqUal, increasing with a magnetic field, above 120°K and show the minima at about 80°and 40°K, respectively, independent of the field. For the B ion, T_1 and T_2 are independent of the field with TS_1/T_2〓2 from 130°K to 300°K. The results are explained semi-quantitatively by the effect of the electron migration in the B sites. Detailed calculations show: (1) T_1 and T_2 for the A ion are governed by the coupling of the nucleus with the migrating electrons through the dipolar interaction below 120°K and through the hyperfine and the A-B exchange interactions above 120°K; (2) the anisotropic and the isotropic hyperfine interactions give the essential contributions to T_1 and T_2 for the B ion, respectively.

• 社団法人日本物理学会の論文
• 1966-07-05

著者

• MIZOGUCHI Tadashi

  The Institute of Physical and Chemical Research

• Inoue Michiko

  The Institute For Solid State Physics University Of Tokyo

• Mizoguchi Tadashi

  The Institute For Solid State Physics The University Of Tokyo

• Mizoguchi Tadashi

  The Institute For Solid State Physics University Of Tokyo

• Mizoguchi T.

  The Institute for Solid State Physics University of Tokyo

関連論文

• Angular Distribution of Positron Annihilation Radiation in Vanadium and Niobium - Experiment
• Nuclear Magnetic Relaxation in Magnetite
• Saturation Magnetization of f.c.c. Iron Alloys Containing Platinum Group Elements
• Magnetic Properties of f.c.c. Fe-Ir Alloys

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