Analysis of cationic impurity impact on hyperfine interactions in magnetite

0395794 - FZÚ 2014 RIV US eng J - Článek v odborném periodiku
Řezníček, R. - Štěpánková, H. - Chlan, V. - Novák, Pavel - Kozlowski, A.
Analysis of cationic impurity impact on hyperfine interactions in magnetite.
IEEE Transactions on Magnetics. Roč. 48, č. 11 (2012), 3039-3042. ISSN 0018-9464. E-ISSN 1941-0069
Institucionální podpora: RVO:68378271
Klíčová slova: iron compounds * magnetic materials * magnetite * nuclear magnetic resonance
Kód oboru RIV: BM - Fyzika pevných látek a magnetismus
Impakt faktor: 1.422, rok: 2012

The Al, Ga, Ti and Zn impurities were studied in high quality single crystal samples of magnetite (Fe3O4. The cases when the valence of the substitution ion differs from that of the original iron ion are of a particular interest. The measurement of nuclear magnetic resonance (NMR) of 57Fe was chosen as the experimental method for its sensitivity to Fe magnetic and electronic structure and to local ordering in the neighborhood of resonating nuclei. Local electronic structure and hence also the hyperfine interactions are affected by the presence of the substitution and thus resonance frequencies of nuclei in the vicinity of the substitution are shifted due to the modified hyperfine field, therefore satellite signals are observed in the NMR spectra. Temperature dependences of spectra above the Verwey transition were measured in a zero external magnetic field.
Trvalý link: http://hdl.handle.net/11104/0223716