Uniaxial magnetic anisotropy in Co2.25Fe0.75O2BO3 compared to Co3O2BO3 and Fe3O2BO ludwigites


Тип публикации: статья из журнала

Год издания: 2011

Идентификатор DOI: 10.1103/PhysRevB.83.144426

Аннотация: Magnetic and Mossbauer spectroscopy (MS) measurements have been performed on a single crystal of Co2.25Fe0.75O2BO3 with ludwigite structure. Two magnetic transitions (T-N = 115 K and T-C = 70 K) were traced from the ac susceptibility temperature dependence. The MS spectra as a function of temperature clearly show the onset of magneПоказать полностьюtic ordering below 115 K. Magnetization measurements on the parent Co3O2BO3 and Fe3O2BO3 compounds have been done for comparison. In Fe3O2BO3 the anisotropy of the different phases has been determined, showing that the anisotropy axis changes from the a to the b axis in the low-temperature antiferromagnetic phase. High magnetic uniaxial anisotropy has been detected for both Co3O2BO3 and Co2.25Fe0.75O2BO3. From the angle-dependent magnetization measurements it is found that in both compounds the easy axis of magnetization is the b [010] axis, where an antiferromagnetic component is superimposed on the main ferromagnetic component. In the c direction the behavior is purely antiferromagnetic. In Co2.25Fe0.75O2BO3 a strong reduction of the remanent magnetization and a very strong increase in coercive field along the b axis with respect to those found in Co3O2BO3 were observed from magnetic hysteresis cycles measured below T-C. The increase of coercive field is caused by the increase of defects upon Co substitution by Fe.

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Выпуск журнала: Vol. 83, Is. 14

ISSN журнала: 24699950

Место издания: COLLEGE PK



  • Bartolome J. (Instituto de Ciencia de Materiales de Aragon,Departamento de Fisica de la Materia Condensada,CSIC-Universidad de Zaragoza)
  • Arauzo A. (Servicio de Instrumentacion Cientifica,Area de Medidas Fisicas,Universidad de Zaragoza)
  • Kazak N.V. (L.V. Kirensky Institute of Physics,SB of RAS)
  • Ovchinnikov S.G. (Siberian State Aerospace University)
  • Ivanova N.B. (Krasnoyarsk State Agrarian University)
  • Knyazev Y.V. (Siberian Federal University)
  • Lyubutin I.S. (Shubnikov Institute of Crystallography,RAS)