Regensburg 2016 – scientific programme
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MA: Fachverband Magnetismus
MA 17: Poster Session I
MA 17.59: Poster
Tuesday, March 8, 2016, 09:30–12:30, Poster B1
Magnetocrystalline anisotropy in nearly-compensated Mn2RuxGa — •Ciaran Fowley1, Karsten Rode2, Davide Betto2, YongChang Lau2, Naganivetha Thiyagarajah2, Gwenael Atcheson2, Jürgen Lindner1, Jürgen Fassbender1,3, Alina Deac1, and Mike Coey2 — 1Institute of Ion Beam Physics and Materials Research, Helmholtz-Zentrum Dresden-Rossendorf — 2Centre for Research on Adaptive Nanostructures and Nanodevices (CRANN), Trinity College Dublin, Dublin 2, Ireland — 3Institute for Physics of Solids, TU Dresden, Dresden, Germany
Mn2RuxGa (MRG) has recently been shown to be a zero-moment ferrimagnetic half-metal, when x ~ 0.5 [1]. When grown on a TiN buffer, directly on a (001)-SrTiO3 substrate, the magnetic easy-axis is perpendicular to the film plane. The moments of the two Mn sub-lattices 4a and 4c, will only be precisely compensated at a fixed temperature because the temperature dependence of the 4c sublattice is much greater than that of the 4a sublattice [2]. For the present sample Tcomp = 350 K, giving a small net magnetization of 50 kA/m at room temperature. We have measured the transverse Hall resistance (Rxy) on samples patterned into Hall bars as a function of external field applied at an angle, θ, to the film normal. We fit the data obtained to a generalised Sucksmith-Thompson (GST) model [3], in order to extract values of the magnetic anisotropy constants K1 and K2. References: [1] Kurt H, et al., PRL 114, 027201 (2014), [2] Betto D et al., PRB 91, 094410 (2015), [3] Sucksmith W and Thompson JE, Proc. R. Soc. London, Ser. A 225, 362 (1954).