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- W4327720929 abstract "Bilayer topological insulator/ferromagnet (TI/FM) heterostructures are promising for spintronic applications due to their low switching energy and therefore power efficiency. Until recently, the reactivity of TIs with FM films was overlooked in the spin-orbit-torque literature, even though there are reports that it is energetically favorable for TIs to react with transition metals and form interfacial layers. In this study, we fabricated a TI/FM heterostructure comprised of molecular beam epitaxy grown ${mathrm{Sb}}_{2}{mathrm{Te}}_{3}$ and dc sputtered ${mathrm{Ni}}_{80}{mathrm{Fe}}_{20}$. Broadband ferromagnetic resonance revealed spin-pumping evident by the significant enhancement in Gilbert damping, which is likely a signature of the topological surface states or the presence of large spin-orbit coupling in the adjacent ${mathrm{Sb}}_{2}{mathrm{Te}}_{3}$. With low-temperature magnetometry, an exchange bias is observed that indicates an exchange interaction between an antiferromagnet (AFM) and an adjacent FM. Cross-section high-angle annular dark-field scanning transmission electron microscopy characterization of the ${mathrm{Sb}}_{2}{mathrm{Te}}_{3}text{ensuremath{-}}mathrm{N}{mathrm{i}}_{80}{mathrm{Fe}}_{20}$ bilayer revealed a complex interface showing diffusion of Fe and Ni into the ${mathrm{Sb}}_{2}{mathrm{Te}}_{3}$ film yielding the formation of a $mathrm{Fe}{mathrm{Te}}_{2} 1Ttext{ensuremath{-}}mathrm{type}$ structural phase. Furthermore, density functional theory calculations revealed that the $mathrm{Fe}{mathrm{Te}}_{2} 1Ttext{ensuremath{-}}mathrm{phase}$ has an AFM ground state. Due to experimental limitations in the electron-energy-loss spectroscopy measurements, the precise chemistry of the interfacial phase could not be determined, therefore it is possible that the $mathrm{Fe}{mathrm{Te}}_{2} 1T$ and/or an intermixed $({mathrm{Fe}}_{1--x}{mathrm{Ni}}_{x}){mathrm{Te}}_{2} 1T$ is the AFM interfacial phase contributing to exchange bias in the system. This work emphasizes the chemical complexity of TI/FM interfaces that host novel, metastable magnetic topological phases and require more in-depth studies of other similar interfaces." @default.
- W4327720929 created "2023-03-18" @default.
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- W4327720929 date "2023-02-15" @default.
- W4327720929 modified "2023-10-18" @default.
- W4327720929 title "Antiferromagnetic <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mrow><mml:mi>Fe</mml:mi><mml:msub><mml:mi>Te</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow><mml:mo> </mml:mo><mml:mrow><mml:mn>1</mml:mn><mml:mi>T</mml:mi><mml:mtext>−</mml:mtext><mml:mi>phase</mml:mi></mml:mrow></mml:math> formation at the <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mrow><mml:msub><mml:mi>Sb</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>Te</mml:mi><mml:mn>3</mml:mn></…" @default.
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- W4327720929 doi "https://doi.org/10.1103/physrevmaterials.7.024406" @default.
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