Effect of Ferromagnet/Organic Semiconductor Interface Defect States on Tunnel Magnetoresistance of Hybrid Magnetic Tunnel Junctions

IF 1.5 4区物理与天体物理 Q3 PHYSICS, CONDENSED MATTER

Physica Status Solidi B-basic Solid State Physics Pub Date : 2024-06-21 DOI:10.1002/pssb.202400059

Yadlapalli Sujatha, Abhishek Pahuja, Debajit Deb

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Abstract

Herein, analytical modeling of Fe3O4/x(≈1.1 nm)/Co (x = rubrene, C60, and bathocuproine (BCP)) magnetic tunnel junctions (MTJs) has been performed using rubrene, C60, and BCP as organic spacer layers. The simulation is considered as nonequilibrium Green's function assuming spin precession at ferromagnet/organic semiconductor (FM/OSC) interface defect states. The voltage‐dependent resistances for both parallel (RP) and antiparallel (RAP) orientations have been observed to be dependent on spin injection from FM/OSC defect states. Pinning well‐dependent defect state depths have been associated with band misalignment‐induced lattice distortion at FM/OSC interface of the devices. The large tunnel magnetoresistance (TMR) response for rubrene‐based MTJ device has been attributed to a higher change of FM/OSC defect state depths with voltage. High TMR may have reduced spin torque‐dependent spin precession, leading to lower spin transfer torque for the rubrene device. Hence, engineering of defect states at the FM/OSC interface may lead to the successful realization of enhanced TMR in organic spacer MTJs for high‐performance spintronic memory applications.

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铁磁体/有机半导体界面缺陷态对混合磁性隧道结隧道磁阻的影响

在此，我们使用红宝石、C60 和 BCP 作为有机间隔层，对 Fe3O4/x（≈1.1 nm）/Co（x = rubrene、C60 和 bathocuproine (BCP)）磁隧道结 (MTJ) 进行了分析建模。模拟被视为非平衡格林函数，假定铁磁体/有机半导体（FM/OSC）界面缺陷态的自旋前驱。据观察，平行（RP）和反平行（RAP）取向的电压相关电阻取决于 FM/OSC 缺陷态的自旋注入。与引脚相关的缺陷态深度与器件 FM/OSC 界面的带错配引起的晶格畸变有关。基于红宝石的 MTJ 器件的隧道磁阻（TMR）响应较大，这是因为 FM/OSC 缺陷态深度随电压的变化较大。高 TMR 可能会减少依赖于自旋转矩的自旋前驱，从而降低红柱石器件的自旋传递转矩。因此，对 FM/OSC 界面的缺陷态进行工程设计可能会成功实现有机间隔 MTJ 的增强 TMR，从而实现高性能的自旋电子存储器应用。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Physica Status Solidi B-basic Solid State Physics 物理-物理：凝聚态物理

CiteScore

3.30

自引率

6.20%

发文量

321

审稿时长

2 months

期刊介绍： physica status solidi is devoted to the thorough peer review and the rapid publication of new and important results in all fields of solid state and materials physics, from basic science to applications and devices. Being among the largest and most important international publications, the pss journals publish review articles, letters and original work as well as special issues and conference contributions. physica status solidi b – basic solid state physics is devoted to topics such as theoretical and experimental investigations of the atomistic and electronic structure of solids in general, phase transitions, electronic and optical properties of low-dimensional, nano-scale, strongly correlated, or disordered systems, superconductivity, magnetism, ferroelectricity etc.