This article is cited in 3 papers

Magnetism

Magnetic properties of CoFeB alloys doped with Dy and Pr

E. N. Kablov^a, O. G. Ospennikova^a, V. P. Piskorskii^a, R. A. Valeev^a, D. V. Korolev^a, O. V. Koplak^b, E. I. Kunitsyna^b, A. D. Talantsev^b, R. B. Morgunov<sup>ab

a</sup> All-Russian Scientific Research Institute of Aviation Materials, Moscow
^b Institute of Problems of Chemical Physics, Russian Academy of Sciences, Chernogolovka, Moscow oblast, 142432, Russia

Abstract: Powders of the ferrimagnetic alloy CoFeBDyPr have been synthesized by the gas atomization method. Annealing of the samples at 900°C leads to the recrystallization of the amorphous phase into the crystalline phase (Pr,Dy)$_2$Fe$_7$Co$_7$B,, which changes the magnetic properties of the alloy (the coercive force decreases, the shape of the magnetic hysteresis loop changes, etc.). The temperature dependences of the remanent magnetization and Mössbauer spectra depend on the size of particles. This indicates the contribution from subsurface magnetic states of the phase of different chemical composition, which is identified by X-ray photoelectron spectroscopy in particles with sizes of less than 10 $\mu$m. A weakening of the dipole-dipole interaction between particles in the sample, where they are diluted in the solid organic matrix (eicosane), leads to a change in the shape of the hysteresis loop. The elimination of the mechanical mobility of particles in eicosane significantly increases (to 2.5 times) the coercive force.

Received: 27.11.2014

 English version: Physics of the Solid State, 2015, 57:6, 1134–1141

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