Počet záznamů: 1

Magnetically dead layers at sp-impurity-decorated grain boundaries and surfaces in nickel

  1. 1.
    0366261 - UFM-A 2012 RIV US eng J - Článek v odborném periodiku
    Všianská, Monika - Šob, Mojmír
    Magnetically dead layers at sp-impurity-decorated grain boundaries and surfaces in nickel.
    Physical Review. B. Roč. 84, č. 1 (2011), Art.n. 014418 ISSN 1098-0121
    Grant CEP: GA AV ČR IAA100100920; GA ČR GD106/09/H035
    Výzkumný záměr: CEZ:AV0Z20410507
    Klíčová slova: magnetically dead layers * sp-impurity-decorated grain boundaries and surfaces * nickel
    Kód oboru RIV: BM - Fyzika pevných látek a magnetismus
    Impakt faktor: 3.691, rok: 2011

    With the help of ab initio electronic structure calculations, we study segregation of the sp elements (Al, Si, P, S, Ga, Ge, As, Se, In, Sn, Sb, and Te) at the Sigma5(210) grain boundary (GB) and (210) free surface (FS) in fcc FM nickel. Whereas there is a slight enhancement of magnetization at the clean GB and FS with respect to bulk nickel (3–7% and 24%, respectively), most of these impurities nearly kill or substantially reduce the magnetic moments at the FS and, when segregating interstitially at the GB (i.e., Si, P, S, Ge, As, and Se), they produce magnetically dead layers at the boundary. We demonstrate that the existence of magnetically dead layers is a common phenomenon at the sp-impurity-decorated GB and FS in nickel. It is caused by a strong hybridization of sp states of the impurities with the d states of nickel and a redistribution of electron states in both majority and minority bands.
    Trvalý link: http://hdl.handle.net/11104/0201314