Static and dynamic properties of [hkl] low-symmetry trilayers

Author(s)

Celino, K. R. ^[1] ; Costa, C. H. ^{[1, 2]} ; Bezerra, C. G. ^[1] ; Chesman, C. ^[1]

Affiliation

^[1] Univ Fed Rio Grande do Norte, Dept Fis Teor & Expt, BR-59078900 Natal, RN - Brazil

^[2] Univ Fed Ceara, Campus Avancado Russas, BR-62900000 Russas - Brazil

• Document type: Journal article
• Source: PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS; v. 253, n. 5, p. 929-941, MAY 2016.
• Web of Science Citations: 0

Abstract

We present a theoretical study about the influence of magneto-crystalline anisotropies on the static and dynamic magnetic properties of trilayers coupled via bilinear and biquadratic exchange fields for situations in which the systems are grown in unusual {[}hkl] low-symmetry directions. We apply a realistic phenomenological model, with a total free magnetic energy that includes Zeeman interaction and magneto-crystalline anisotropies as well as exchange energy terms. We consider parameters from the literature to illustrate our results for Fe/Cr/Fe systems. In particular, a total of six different magnetic scenarios for the {[}211] and {[}321] low-symmetry growth orientations and three sets of exchange fields were analyzed, and the associated magnetization, magnetoresistance, and spin-wave frequencies were calculated. Our results show that the combination of magneto-crystalline symmetries and exchange fields leads to various interesting properties, including different values of the saturation field for the magnetization and magnetoresistance curves. Regarding the spin-wave modes, we observed the presence of Goldstone modes, associated with second-order phase transitions, resulting from the competition between the Zeeman and biquadratic energies. (C) 2016 WILEY-VCH Verlag GmbH \& Co. KGaA, Weinheim (AU)