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2023 Fiscal Year Final Research Report

Creation of gradient spintronics based on oxide thin films with strong spin-orbit interaction

Research Project

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Project/Area Number 22K14595
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 29020:Thin film/surface and interfacial physical properties-related
Research InstitutionTohoku University

Principal Investigator

Kaminaga Kenichi  東北大学, 工学研究科, 助教 (50831301)

Project Period (FY) 2022-04-01 – 2024-03-31
Keywordsスピントロニクス / パルスレーザー堆積法 / PLD / 酸化物 / 超伝導
Outline of Final Research Achievements

The primary objective of this study is to assess the efficiency of spin current/current conversion in heterostructures featuring ferromagnetic insulators, utilizing thin films of oxides characterized by strong spin-orbit interaction. This investigation focuses on La1-xSrxMnO3 (LSMO), a heavy-element-doped perovskite manganese oxide. The study compares gradient structures incorporating graded-composition hetero-interfaces with uniform-composition heterostructures, employing both LSMO and LSMIO. Unexpectedly, during the course of the study, it was observed that the LSMIO thin film demonstrates superconducting properties, with a maximum transition temperature (Tc) of 125 K achieved at approximately 10% Ir substitution concentration. Despite deviating from the original research objective, this discovery warrants further investigation and may contribute valuable insights to the field.

Free Research Field

スピントロニクス

Academic Significance and Societal Importance of the Research Achievements

LSMO薄膜は強磁性ハーフメタルで、Ptなどの電極層と組み合わせてスピントロニクスデバイスに使われている。Ru:LSMO薄膜にも同様の応用が期待されるが、傾斜組成構造とスピントロニクスの融合研究は新規である。ガルバノミラー走査型PLD装置を使えば、連続的な組成傾斜を作り出せ、磁気モーメントのスピントランスファートルクが増大し、均一組成薄膜よりもスピン特性が向上する可能性が高い。本研究は、この相関を明らかにし、LSMOなどをベースにした新たな分野「グラデーションスピントロニクス」の開拓するうえでの基礎学理の構築に貢献できたことが本研究の学術的意義と考えられる。

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Published: 2025-01-30  

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