Response of magnetically frustrated nanostructures to external magnetic fields: Stepped Cr/Fe interfaces

Autor(en): Tan, H.
Martinez, E.
Borstel, G.
Vega, A.
Stichwörter: EXCHANGE; MAGNETORESISTANCE; Materials Science; Materials Science, Multidisciplinary; MULTILAYERS; Physics; Physics, Applied; Physics, Condensed Matter; SPIN-DENSITY WAVES; SUPERLATTICES
Erscheinungsdatum: 2010
Volumen: 81
Ausgabe: 17
The response of typical magnetically frustrated systems to an external magnetic field is investigated in order to get insight on the qualitative trends and their origin at the electronic-structure level. Electronic-structure calculations are conducted for Cr overlayers of different thickness on the stepped Fe(001) substrate, using a self-consistent noncollinear tight-binding method in which the Hamiltonian has been extended to account for the interaction with the external field. The average magnetization at the Cr overlayers is obtained through the local magnetic moments distribution of the system at different external magnetic fields. The complex nonmonotonous behavior of the remagnetization process as a function of the external field is explained in terms of the local geometrical and chemical environment of the inequivalent Cr atoms which leads to local magnetic couplings having different response. In particular, we find minima at low fields due to the strength of the local antiferromagnetic couplings and changes in slope at higher fields associated to spin-flip transitions taking place at certain Cr atoms when the system is trapped in collinear magnetic configurations.
ISSN: 10980121
DOI: 10.1103/PhysRevB.81.174426

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