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29 September 2017 Perpendicular magnetic anisotropy in Bismuth substituted nanometers thick YIG films (Conference Presentation)
Lucile Soumah, Lilia Qassym, Cécile Carretero, Eric Jacquet, Jamal Ben-Youssef, Richard Lebourgeois, Nathan Beaulieu, Vincent Cros, Paolo Bortolotti, Abdelmadjid Anane
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Proceedings Volume 10357, Spintronics X; 103571B (2017) https://doi.org/10.1117/12.2273376
Event: SPIE Nanoscience + Engineering, 2017, San Diego, California, United States
Abstract
Pulsed laser deposition (PLD) of high quality nanometers thick (YIG) films have recently allowed to open the field of spintronics and magnonics nanostructured magnetic insulators[1,2]. YIG is a versatile material in term of anisotropy or magnetization as doping and growth induced strain can significantly change those properties. We present here the effect of Bi substitution on Bi:YIG PLD grown films with thicknesses ranging from 10 nm to 40 nm. By using lattice matched substituted GGG substrates (sGGG) it is possible to stabilize for specific growth conditions an out-of plane easy magnetization axis. We present comprehensive structural charcterisation using X-ray diffraction and squid magnetometry that shows the transition from an easy in-plane magnetization direction to an out-of plane magnetization. The effect of Bi doping is to significantly increase the Faraday rotation of the films. Using magneto-optical Kerr microscopy, it is therefore possible to observ the shape and the sizes of the magnetic domains for films thicknesses down to 10 nm. Using the Kooy and Enz model it is possible to extract a domain wall energy of 0.49 erg/cm2. [1] O. D. Kelly et al., Applied Physics Letters 103, 4, 082408 (2013). [2] M. Collet et al., Nature communications 7, 10377 (2016). [3] C. Kooy and U. Enz, Philips Res. Rep., vol. 15, pp. 7-29(1960)
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Lucile Soumah, Lilia Qassym, Cécile Carretero, Eric Jacquet, Jamal Ben-Youssef, Richard Lebourgeois, Nathan Beaulieu, Vincent Cros, Paolo Bortolotti, and Abdelmadjid Anane "Perpendicular magnetic anisotropy in Bismuth substituted nanometers thick YIG films (Conference Presentation)", Proc. SPIE 10357, Spintronics X, 103571B (29 September 2017); https://doi.org/10.1117/12.2273376
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KEYWORDS
Magnetism
Bismuth
Anisotropy
Doping
Applied physics
Microscopy
Nanostructuring
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