A
A. Richardella
Researcher at Pennsylvania State University
Publications - 40
Citations - 3754
A. Richardella is an academic researcher from Pennsylvania State University. The author has contributed to research in topics: Topological insulator & Spin polarization. The author has an hindex of 20, co-authored 36 publications receiving 3198 citations.
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Journal ArticleDOI
Spin-transfer torque generated by a topological insulator
Alex Mellnik,Joon Sue Lee,A. Richardella,Jennifer Grab,Peter J. Mintun,Mark H. Fischer,Abolhassan Vaezi,Aurelien Manchon,Eun-Ah Kim,Nitin Samarth,Daniel C. Ralph +10 more
TL;DR: In this article, it was shown that charge current flowing in-plane in a thin film of the topological insulator bismuth selenide (Bi2Se3) at room temperature can indeed exert a strong spin-transfer torque on an adjacent ferromagnetic permalloy (Ni81Fe19) thin film, with a direction consistent with that expected from the topologically surface state.
Journal ArticleDOI
Observation of quantum-tunnelling-modulated spin texture in ultrathin topological insulator Bi2Se3 films
Madhab Neupane,A. Richardella,Jaime Sánchez-Barriga,Su-Yang Xu,Nasser Alidoust,Ilya Belopolski,Chang Liu,Guang Bian,Duming Zhang,Dmitry Marchenko,Andrei Varykhalov,Oliver Rader,M. Leandersson,Thiagarajan Balasubramanian,Tay-Rong Chang,Horng-Tay Jeng,Horng-Tay Jeng,Susmita Basak,Hsin Lin,Arun Bansil,Nitin Samarth,M. Zahid Hasan +21 more
TL;DR: In this paper, the authors used spin-resolved photoemission spectroscopy with p-polarized light in topological insulator Bi2Se3 thin films.
Journal ArticleDOI
Hedgehog spin texture and Berry's phase tuning in a magnetic topological insulator
Su-Yang Xu,Madhab Neupane,Chang Liu,Duming Zhang,A. Richardella,L. Andrew Wray,L. Andrew Wray,Nasser Alidoust,M. Leandersson,Thiagarajan Balasubramanian,Jaime Sánchez-Barriga,Oliver Rader,Gabriel Landolt,Gabriel Landolt,Bartosz Slomski,Bartosz Slomski,Jan Hugo Dil,Jan Hugo Dil,Jürg Osterwalder,Tay-Rong Chang,Horng-Tay Jeng,Horng-Tay Jeng,Hsin Lin,Arun Bansil,Nitin Samarth,M. Zahid Hasan +25 more
TL;DR: In this article, the authors demonstrate magnetically induced spin reorientation phenomena simultaneous with a Dirac-metal to gapped-insulator transition on the surfaces of manganese-doped Bi2Se3 thin films.
Journal ArticleDOI
Room-Temperature Spin-Orbit Torque Switching Induced by a Topological Insulator.
TL;DR: In this paper, the spin-orbit torque switching in a TI-ferrimagnet heterostructure with perpendicular magnetic anisotropy at room temperature was investigated and the obtained effective spin Hall angle of TI was substantially larger than the previously studied heavy metals.
Journal ArticleDOI
Surface-State-Dominated Spin-Charge Current Conversion in Topological-Insulator-Ferromagnetic-Insulator Heterostructures.
Hailong Wang,James Kally,Joon Sue Lee,Tao Liu,Houchen Chang,Danielle Reifsnyder Hickey,K. Andre Mkhoyan,Mingzhong Wu,A. Richardella,Nitin Samarth +9 more
TL;DR: It is shown that the spin-charge conversion efficiency, characterized by the inverse Rashba-Edelstein effect length (λ_{IREE}), increases dramatically as the film thickness is increased from two quintuple layers, saturating above six quint triple layers, suggesting a dominant role of surface states in spin and charge interconversion in topological-insulator-ferromagnet heterostructures.