Demonstration of efficient spin injection and detection in various systems using Fe3O4 based spin injectors

Bhat, Shwetha G and Kumar, Anil PS (2016) Demonstration of efficient spin injection and detection in various systems using Fe3O4 based spin injectors. In: 13th Joint Magnetism and Magnetic Materials (MMM)/Intermag Conference, JAN 11-15, 2016, San Diego, CA.

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Abstract

Half-metal based spin injector devices for spin injection and detection application have proven to be efficient owing to their enhanced injection and detection efficiency. In this study, we extend the all-electrical spin injection and detection studies into different systems like Si and GaAs using half-metal Fe3O4 as a spin injector in the presence and absence of tunnel barrier MgO. Injection into GaAs is verified using conventional Fe/MgO/GaAs devices. Room temperature spin injection into both p-type and n-type Si is achieved and the spin injection could be observed down to 100K. Obtained spin relaxation time for these n-type and p-type Si at different temperatures agree well with the existing reports. Further, the temperature dependent spin injection and detection is also successfully achieved in Fe3O4/GaAs (n-type) Schottky devices, and a comparison study of the results with control experiment using Fe/MgO/GaAs (n-type) devices confirm the relaxation to be similar in the GaAs substrate, as expected. Hence, even Fe3O4 material can be effectively used as an efficient spin injector as well as detector, making it an attractive candidate for the room temperature spintronics device applications. (C) 2016 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution 3.0 Unported License.

Item Type:	Conference Proceedings
Publication:	AIP ADVANCES
Publisher:	AMER INST PHYSICS
Additional Information:	Copy right for this article belongs to the AMER INST PHYSICS, 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	19 Jul 2016 10:03
Last Modified:	19 Jul 2016 10:03
URI:	http://eprints.iisc.ac.in/id/eprint/54203

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