Počet záznamů: 1  

Ellipsometry applied to phase transitions and relaxation phenomena in Ni.sub.2./sub.MnGa ferromagnetic shape memory alloy

  1. 1.
    0381823 - FZÚ 2015 RIV US eng J - Článek v odborném periodiku
    Dejneka, Alexandr - Zablotskyy, Vitaliy A. - Tyunina, Marina - Jastrabík, Lubomír - Pérez-Landazábal, J.I. - Recarte, V. - Sánchez-Alarcos, V. - Chernenko, V.A.
    Ellipsometry applied to phase transitions and relaxation phenomena in Ni2MnGa ferromagnetic shape memory alloy.
    Applied Physics Letters. Roč. 101, č. 14 (2012), "141908-1"-"141908-5". ISSN 0003-6951. E-ISSN 1077-3118
    Grant CEP: GA TA ČR TA01010517; GA ČR GAP108/12/1941
    Výzkumný záměr: CEZ:AV0Z10100522
    Klíčová slova: shape memory alloy * ellipsometry * Ni2MnGa
    Kód oboru RIV: BM - Fyzika pevných látek a magnetismus
    Impakt faktor: 3.794, rok: 2012
    http://dx.doi.org/10.1063/1.4757393

    The temperature dependences of the refractive index, n(T), calculated from ellipsometric data during the premartensitic and martensite transitions in a Ni2MnGa ferromagnetic shape memory alloy allow to detect all critical temperatures of the sample. The performed measurements reveal the behavior of a surface layer of a few tens nanometers depth due to the light absorption. The underlying mechanisms of the observed temperature changes of the equilibrium n0 may be related to temperature dependent interactions between free electrons and phonons as well as between electrons and defects.A giant isothermal creep (up to 20%) of the refractive index was found for temperatures below T0 = 315 K. Below T0 the creep amplitude grows with the temperature difference T0 - T. The creep disappears and the relaxation time becomes zero at temperatures about T0 .
    Trvalý link: http://hdl.handle.net/11104/0212204

     
     
Počet záznamů: 1  

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