Berlin 2018 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 10: Heusler Compounds, Semimetals and Oxides (joint session MA/TT)

TT 10.1: Talk

Monday, March 12, 2018, 09:30–09:45, EB 301

Epitaxial growth of compensated ferrimagnetic Heusler thin films Mn-Fe-V-Al — •Siham Ouardi, Kazuya Z. Suzuki, and Shigemi Mizukami — WPI Advanced Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan

Cubic Heusler compound Mn_1.5FeV_0.5Al is a fully compensated half-metallic ferrimagnet with 24 valence electrons per formula unit. Here we report on epitaxial growth of the compensated ferrimagnetic Mn-Fe-V-Al Heusler films. The thin films of 30 nm thickness were grown directly on single crystalline MgO (001) substrates by using an ultra-high-vacuum magnetron sputtering technique. The Heusler structure was characterized by x-ray diffraction. The crystal structure ordering was controlled by the deposition at various substrate temperatures. Magnetometry measurements show a nearly vanishing magnetization where the anomalous Hall measurements exhibited magnetic ordering. The ferrimagnetic coupling between the different sublattices (Mn, Fe, and V) will discussed based on magnetic dichroism in angle-resolved hard X-ray photoelectron spectroscopy (MCD-HAXPES). The advantage of vanishing magnetization in combination with high spin polarization of this material thin films provides the possibility for spintronic device applications.

This work is supported by the Grant-in-Aid for Scientific Research KAKENHI (17H06513).