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HL: Fachverband Halbleiterphysik
HL 25: Oxide Semiconductors I
HL 25.8: Vortrag
Mittwoch, 20. März 2024, 11:45–12:00, ER 325
Magnetostriction in spinel zinc ferrite revisited: A first-principles investigation — •Daniel Fritsch — Zuse Institute Berlin, Takustr. 7, 14195 Berlin, Germany
Magnetostriction describes the property of materials to change its length or volume when going from randomly oriented magnetic moments to an ordered state by placing it in a magnetic field. Typically, these changes are of the order 10−6 or less, however, some materials have been shown to show larger magnetostriction, and have consequently been employed for sensor applications.
Among the material class of spinel ferrites, CoFe2O4 shows very large magnetostriction [1], and a recent experimental investigation reported similar in ZnFe2O4. Here, we revisit magnetostriction in ZnFe2O4 by means of first-principles calculations, employing density functional theory and hybrid exchange and correlation functionals [2], together with a recently devised method to speed-up these calculations [3]. The obtained results will be discussed with respect to available experimental findings and complement our knowledge about magnetostriction in spinel ferrites.
[1] D. Fritsch and C. Ederer, Phys Rev B 82, 104117 (2010), Phys. Rev. B 86, 014406 (2012).
[2] D. Fritsch, J. Phys.: Condens. Matter 30, 095502 (2018).
[3] D. Fritsch, Appl. Sci. 12, 2576 (2022).
Keywords: Spinel ferrites; Magnetostriction; First-principles calculations; Density Functional Theory; Hybrid functionals