Regensburg 2016 – scientific programme

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MA: Fachverband Magnetismus

MA 48: Poster Session II

MA 48.43: Poster

Thursday, March 10, 2016, 15:00–18:00, Poster B1

Mg diffusion in Fe₃O₄ based magnetic tunnel junctions with MgO barrier — •Luca Marnitz¹, Tobias Peters¹, Denis Dyck¹, Jari Rodewald², Olga Kuschel², Joachim Wollschläger², Stephan Wallek², Karsten Rott¹, Jan-Michael Schmalhorst¹, Thorsten Glaser², Günter Reiss¹, and Timo Kuschel¹ — ¹Bielefeld University, Germany — ²Universität Osnabrück, Germany

Due to its high spin polarization and Curie temperature, magnetite (Fe₃O₄) is a promising material for room temperature applications in spintronics and spincalorics. In a previous publication, a sign change in the tunneling magnetoresistance of CoFeB/MgO/Fe₃O₄/MgO(001) magnetic tunnel junctions was observed after annealing at temperatures above 240^∘C [1]. Mg diffusion from the MgO through the Fe₃O₄ is a possible explanation for this behaviour [2]. Further studies, including Sputter-Auger-Spectroscopy and X-ray Reflectivity have been undertaken to investigate this effect. Additionally, low temperature SQUID and Raman Spectroscopy measurements have been performed to characterise the magnetite samples.

[1] L. Marnitz et al., AIP Adv. 5, 047103 (2015)

[2] K. A. Shaw et al., J. Appl. Phys. 81, 5176 (1997)