Article (Scientific journals)
Roadmap for the Design of All Ferromagnetic Four-Terminal Spin Valves and the Extraction of Spin Diffusion Length
Fourneau, Emile; Silhanek, Alejandro; Nguyen, Ngoc Duy
2021In Physical Review Applied, 15 (3), p. 034058
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Keywords :
Spintronics; Graphene; Spin transport
Abstract :
[en] Graphene is a promising substrate for future spintronic devices owing to its remarkable electronic mobility and low spin-orbit coupling. Hanle precession in spin-valve devices is commonly used to evaluate spin diffusion and spin lifetime. In this work, we demonstrate that this method is no longer accurate when the distance between the inner and outer electrodes is smaller than 6 times the spin diffusion length, leading to errors as large as 50% for the calculation of the spin figures of merit of graphene-based devices. We suggest simple but efficient approaches to circumvent this limitation by addressing a revised version of the Hanle fit function. Complementarily, we provide clear guidelines for the design of four-terminal nonlocal spin valves suitable for the flawless determination of the spin lifetime and the spin diffusion coefficient.
Research Center/Unit :
CESAM - Complex and Entangled Systems from Atoms to Materials - ULiège
Disciplines :
Physics
Author, co-author :
Fourneau, Emile  ;  Université de Liège - ULiège > Département de physique > Physique des solides, interfaces et nanostructures
Silhanek, Alejandro  ;  Université de Liège - ULiège > Département de physique > Physique expérimentale des matériaux nanostructurés
Nguyen, Ngoc Duy  ;  Université de Liège - ULiège > Département de physique > Physique des solides, interfaces et nanostructures
Language :
English
Title :
Roadmap for the Design of All Ferromagnetic Four-Terminal Spin Valves and the Extraction of Spin Diffusion Length
Publication date :
19 March 2021
Journal title :
Physical Review Applied
eISSN :
2331-7019
Publisher :
American Physical Society, College Park, United States - Maryland
Volume :
15
Issue :
3
Pages :
034058
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 02 December 2020

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