High spin polarization and spin signal enhancement in non-local spin valves with Co–Fe alloy injectors and detectors

Author:

Kaiser B.1ORCID,Ramberger J.1ORCID,Watts J. D.1ORCID,Dewey J.1ORCID,Leighton C.1ORCID

Affiliation:

1. Department of Chemical Engineering and Materials Science, University of Minnesota , Minneapolis, Minnesota 55455, USA

Abstract

For applications such as spin accumulation sensors for next-generation hard disk drive read heads, and for fundamental research, it is desirable to increase the spin signal in metallic non-local spin valves, which are central devices in spintronics. To this end, here, we report on the integration of high-spin-polarization Co–Fe binary alloy ferromagnetic injectors and detectors in Al-based non-local spin valves. Room-temperature deposition on amorphous substrates from an alloy target is shown to generate smooth, polycrystalline (110-textured), solid-solution body-centered-cubic Co75Fe25 films, which we characterize by energy dispersive x-ray spectroscopy, x-ray diffraction, x-ray reflectivity, atomic force microscopy, and electronic transport. Simple integration into transparent-interface Al non-local spin valves is then shown to realize up to a factor of ∼5 enhancement of the spin signal relative to Co, with full quantitative analysis yielding strikingly temperature-independent current spin polarizations exceeding 60%. We make a detailed quantitative comparison of these values with prior literature, concluding that Co–Fe alloys present a remarkably facile route to higher spin polarization and spin signals in non-local spin valves, with minimal barrier to adoption.

Funder

National Science Foundation

Advanced Storage Research Consortium

Publisher

AIP Publishing

Subject

General Engineering,General Materials Science

Cited by 1 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. PHYSICO-CHEMICAL PROPERTIES OF AMORPHOUS COBALT-BASED ALLOYS: A REVIEW;Proceedings of the Shevchenko Scientific Society. Series Сhemical Sciences;2023-09-29

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