The In Situ Optimization of Spinterface in Polymer Spin Valve by Electronic Phase Separated Oxides

Cheng Zhang; Shuaishuai Ding; Yuan Tian; Jing Wang; Yunzhong Chen; Tongyun Zhao; Fengxia Hu; Wenping Hu; Baogen Shen

doi:10.1002/smll.202303375

The In Situ Optimization of Spinterface in Polymer Spin Valve by Electronic Phase Separated Oxides

Small. 2023 Oct;19(40):e2303375. doi: 10.1002/smll.202303375. Epub 2023 Jun 1.

Authors

Cheng Zhang^{1

2}, Shuaishuai Ding³, Yuan Tian⁴, Jing Wang², Yunzhong Chen^{2

5}, Tongyun Zhao^{2

5}, Fengxia Hu^{2

5

6}, Wenping Hu^{3

7}, Baogen Shen^{1

2

5

8}

Affiliations

¹ Ningbo Institute of Materials Technology & Engineering, Chinese Academy of Sciences, Ningbo, Zhejiang, 315201, China.
² Beijing National Laboratory of Condensed Matter Physics & Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China.
³ Tianjin Key Laboratory of Molecular Optoelectronic Sciences, Department of Chemistry, Institute of Molecular Aggregation Science, Tianjin University, Tianjin, 300072, China.
⁴ School of Physics & Electronics, Hunan University, Hunan, 410082, China.
⁵ School of Physical Sciences, University of Chinese Academy of Sciences, Beijing, 100049, China.
⁶ Songshan Lake Materials Laboratory, Dongguan, Guangdong, 523808, China.
⁷ Joint School of National University of Singapore and Tianjin University, International Campus of Tianjin University, Binhai New City, Fuzhou, 350207, China.
⁸ Ganjiang Innovation Academy, Chinese Academy of Sciences, Ganzhou, Jiangxi, 341000, China.

PMID: 37264712
DOI: 10.1002/smll.202303375

Abstract

Tailoring the interface between organic semiconductor (OSC) and ferromagnetic (FM) electrodes, that is, the spinterface, offers a promising way to manipulate and optimize the magnetoresistance (MR) ratio of the organic spin valve (OSV) devices. However, the non-destructive in situ regulation method of spinterface is seldom reported, limiting its theoretical research and further application in organic spintronics. (La_2/3 Pr_1/3 )_5/8 Ca_3/8 MnO₃ (LPCMO), a recently developed FM material, exhibits a strong electronic phase separation (EPS) property, and can be employed as an effective in situ spinterface adjuster. Herein, we fabricated a LPCMO-based polymer spin valve with a vertical configuration of LPCMO/poly(3-hexylthiophene-2,5-diyl) (P3HT)/Co, and emphasized the important role of LPCMO/P3HT spinterface in MR regulation. A unique competitive spin-scattering mechanism generated by the EPS characteristics of LPCMO inside the polymer spin valve was discovered by abstracting the anomalous non-monotonic MR value as a function of pre-set magnetic field (B_pre ) and temperature (T). Particularly, a record-high MR ratio of 93% was achieved in polymer spin valves under optimal conditions. These findings highlight the importance of interdisciplinary research between organic spintronics and EPS oxides and offer a novel scenario for multi-level storage via spinterface manipulation.

Keywords: electronic phase separation; perovskite oxides; polymer spin valves; spinterface; spintronics.

Abstract

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