The influence of contact resistance and interface layers in extraordinary magnetoresistance devices

IF 3.5 2区物理与天体物理 Q2 PHYSICS, APPLIED

Applied Physics Letters Pub Date : 2025-04-04 DOI:10.1063/5.0237591

Sreejith Sasi Kumar, Lou Bork, Stefan Pollok, Rasmus Bjørk, Dennis Valbjørn Christensen

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Abstract

The electrical resistance change of a device when subjected to applied magnetic fields is essential for magnetoresistive magnetometers as well as for studying fundamental transport phenomena in condensed matter. One of the largest magnetoresistances at room temperature is observed in extraordinary magnetoresistance (EMR) devices composed of high-mobility materials with metal inclusions. However, the contact resistance between the constituent materials is often detrimental to their performance. In this work, we study the influence of the interface-near region on the performance of EMR devices using a numerical model, which mimics local doping, carrier depletion, and mobility degradation by independently varying the carrier density and mobility of an interfacial layer. We show that the magnetoresistance decreases by five orders of magnitude when the specific contact resistance increases from 10−5 to 10−2Ω cm2. Our results also show that it is beneficial to increase the conductivity of the interface layer, even at the expense of degrading either its carrier density or mobility. This study paves the way for designing contacting strategies for realizing high-performing EMR devices.

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来源期刊

Applied Physics Letters 物理-物理：应用

CiteScore

6.40

自引率

10.00%

发文量

1821

审稿时长

1.6 months

期刊介绍： Applied Physics Letters (APL) features concise, up-to-date reports on significant new findings in applied physics. Emphasizing rapid dissemination of key data and new physical insights, APL offers prompt publication of new experimental and theoretical papers reporting applications of physics phenomena to all branches of science, engineering, and modern technology. In addition to regular articles, the journal also publishes invited Fast Track, Perspectives, and in-depth Editorials which report on cutting-edge areas in applied physics. APL Perspectives are forward-looking invited letters which highlight recent developments or discoveries. Emphasis is placed on very recent developments, potentially disruptive technologies, open questions and possible solutions. They also include a mini-roadmap detailing where the community should direct efforts in order for the phenomena to be viable for application and the challenges associated with meeting that performance threshold. Perspectives are characterized by personal viewpoints and opinions of recognized experts in the field. Fast Track articles are invited original research articles that report results that are particularly novel and important or provide a significant advancement in an emerging field. Because of the urgency and scientific importance of the work, the peer review process is accelerated. If, during the review process, it becomes apparent that the paper does not meet the Fast Track criterion, it is returned to a normal track.