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SUMMARY:ATTENTION !!! CHANGEMENT D’HORAIRE - Thermal and dynamical properties of the permanent magnet Nd2Fe14B at finite temperatures
UID:evenement5255 @ http://sfp.grenoble.cnrs.fr
DTSTAMP:20180914T140000
DTSTART:20180914T140000
DTEND:20180914T150000
LOCATION:Salle « Remy Lemaire » (K223) de l’Institut Néel – au n°25 de la rue des martyrs\, Grenoble.
DESCRIPTION:The thermal and dynamical properties of Nd2Fe14B at finite temperatures are studied with an atomic model Hamiltonian with microscopic parameters[1\,2]. We have studied temperature dependences of the magnetization including the reorientation transition\, anisotropy constant s[3]\, and also domain wall shape[4]\, etc. The atom-specific information has been also obtained. E.g.\, it was found that the magnetic moment of Nd decreases faster than that of Fe with increasing temperature[3]\, and also dependence of the exchange stiffness constant on the lattice axes has been obtained[4\,5]. Effects of the dipole-dipole interaction are studied introducing a new numerical algorithm[6]\, where the role of Fe ion for the coercive force at high temperature was pointed out\, and also various non-uniform magnetic patterns (e.g.\, maze pattern) are presented. In addition to the static thermal properties\, dynamics of the magnetization in unfavorable magnetic field has been studied by stochastic LLG equation [4\,7\,8] and also by Monte Carlo methods. Temperature dependence of spectrum of the ferromagnetic resonance is discussed in the relation to the reorientation transition[9]. By making use of LLG equation and also by a MC method for free energy barrier\, temperature dependence of the coercive field is discussed. [1] S. Hirosawa\, M. Nishino\, S. Miyashita\, Adv. Nat. Sci. : Nanosci. Nanotechnol. 8 (2017) 013002. [2] S. Miyashita\, M. Nishino\, Y. Toga\, T. Hinokihara\, T. Miyake\, S. Hirosawa and A. Sakuma\, Scripta Materialia\, in press. [3] Y. Toga\, M. Matsumoto\, S. Miyashita\, H. Akai\, S. Doi\, T. Miyake\, and A. Sakuma : Phys. Rev. B 94\, 174433 (2016). & Phys. Rev. B 94\, 219901 (2016). [4] M. Nishino\, Y. Toga\, S. M.\, H. Akai\, A. Sakuma\, and S. Hirosawa\, Phys. Rev. B 95\, 094429 (2017). [5] Y. Toga\, M. Nishino\, S. Miyashita\, T. Miyake\, and A. Sakuma\, in preparation (Phys. Rev. B). [6] T. Hinokihara\, M. Nishino\, Y. Toga\, and S. Miyashita\, Phys. Rev. B97\, 104427 (2018). [7] M. Nishino and S. Miyashita\, Phys. Rev. B91\, 134411(1-13) (2015). [8] S. Mohakud\, S. Andraus\, M. Nishino\, A. Sakuma\, S. M.\, Phys. Rev. B 94\, 054430 (2016). [9] M. Nishino and S. Miyashita\, in preparation. All people who do not have a CNRS badge must inform us of their arrival nora.dempsey@neel.cnrs.fr Contact : nora.dempsey@neel.cnrs.fr
URL: test.ics
STATUS:CONFIRMED
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