Publications

For statistics please refer to Google Scholar

2021

 

Y.-T. Liu, C.-C. Huang, K.-H. Chen, Y.-H. Huang, C.-C. Tsai, T.-Y. Chang, C.-F. Pai*, "Anatomy of Type-X Spin-Orbit Torque Switching," Physical Review Applied 16, 024021 (2021).

 

T.-Y. Chang, C.-L. Cheng, C.-C. Huang, C.-W. Peng, Y.-H. Huang, T.-Y. Chen, Y.-T. Liu, and C.-F. Pai*, "Large Unidirectional Magnetoresistance in Metallic Heterostructures in the Spin Transfer Torque Regime," Physical Review B 104, 024432 (2021).

 

S.-J. Lin, Y.-L. Huang, MY Song, C.-M. Lee, F. Xue, G.-L. Chen, S.-Y. Yang, Y.-J. Chang, I-J. Wang, Y.-C. Hsin, Y.-H. Su, J.-H. Wei, C.-F. Pai, S. X. Wang, C. H. Diaz, "Challenges toward Low-Power SOT-MRAM," IEEE International Reliability Physics Symposium (IRPS) (2021).

 

M.-H. Nguyen* and C.-F. Pai*, "Spin-Orbit Torque Characterization in a Nutshell," APL Materials 9, 030902 (2021).

 

C.-W. Peng, W.-B. Liao, T.-Y. Chen, and C.-F. Pai*, "Efficient Spin-Orbit Torque Generation in Semiconducting WTe2 with Hopping Transport," ACS Appl. Mater. Interfaces 13, 15950 (2021).

 

 

2020

 

W.-B. Liao, T.-Y. Chen, Y.-C. Hsiao, and C.-F. Pai*, "Pulse-width and Temperature Dependence of Memristive Spin-Orbit Torque Switching," Applied Physics Letters 117, 182402 (2020).

 

C.-Y. Hu and C.-F. Pai*, "Benchmarking of spin-orbit torque switching efficiency in Pt alloys," Advanced Quantum Technologies 3, 2000024 (2020).

 

Y.-T. Liu, T.-Y. Chen, T.-H. Lo, T.-Y. Tsai, S.-Y. Yang, Y.-J. Chang, J.-H. Wei, and C.-F. Pai*, "Determination of Spin-Orbit Torque Efficiencies in Heterostructures with In-plane Magnetic Anisotropy," Physical Review Applied 13, 044032 (2020).

 

T.-Y. Chen, W.-B. Liao, T.-Y. Chen, T.-Y. Tsai, C.-W. Peng, and C.-F. Pai*, "Current-induced spin-orbit torque efficiencies in W/Pt/Co/Pt heterostructures," Applied Physics Letters 116, 072405 (2020).

 

S. Z. Rahaman, I.-J. Wang, D.-Y. Wang, C.-F. Pai, Y.-C. Hsin, S.-Y. Yang, H.-H. Lee, Y.-J. Chang, Y.-C. Kuo, Y.-H. Su, G.-L. Chen, F.-M. Chen, J.-H. Wei, T.-H. Hou,  S.-S. Sheu, C.-I. Wu, and D.-L. Deng, "Size-Dependent Switching Properties of Spin-Orbit Torque MRAM With Manufacturing-Friendly 8-Inch Wafer-Level Uniformity," IEEE Journal of the Electron Devices Society 8, 163 (2020).

 

T.-H. Lo, Y.-C. Weng, C.-F. Pai, J. G. Lin, "Effect of asymmetric Pt thickness on the inverse spin Hall voltage in Pt/Co/Pt trilayers," AIP Advances 10, 025120 (2020).

 

T.-Y. Chen, C.-W. Peng, T.-Y. Tsai, W.-B. Liao, C.-T. Wu, H.-W. Yen, and C.-F. Pai*, "Efficient Spin-Orbit Torque Switching with Nonepitaxial Chalcogenide Heterostructures," ACS Appl. Mater. Interfaces 12, 7788 (2020).

 

 

2019

 

N. Murray, W.-B. Liao, T.-C. Wang, L.-J. Chang, L.-Z. Tsai, T.-Y. Tsai, S.-F. Lee, and C.-F. Pai*, "Field-free spin-orbit torque switching through domain wall motion," Physical Review B 100, 104441 (2019).

 

W.-B. Liao, T.-Y. Chen, Y. Ferrante, S. S. P. Parkin, and C.-F. Pai*, "Current-induced magnetization switching by the high spin Hall conductivity α-W," Physica Status Solidi (RRL) - Rapid Research Letters 13, 1900408 (2019).

 

T.-C. Chuang, C.-F. Pai, and S.-Y. Huang, “Cr-induced perpendicular magnetic anisotropy and field-free spin-orbit torque switching”, Physical Review Applied 11, 061005 (2019).

 

 

2018

 

T.-Y. Chen, Y. Ou, T.-Y Tsai, R. A. Buhrman, and C.-F. Pai*, "Spin-orbit torques acting upon a perpendicularly-magnetized Py layer," APL Materials 6, 121101 (2018).

 

T.-Y. Chen, H.-I. Chan, W.-B. Liao, and C.-F. Pai*, "Current-induced spin-orbit torque and field-free switching from Mo-based magnetic heterostructures," Physical Review Applied 10, 044038 (2018).

 

Chi-Feng Pai*, "Switching by Topological Insulators," Nature Materials 17, 755 (2018).

 

Sk. Z. Rahaman, I.-J. Wang, T.-Y. Chen, C.-F. Pai, D.-Y. Wang, J.-H. Wei, H.-H. Lee, Y.-C. Hsin, Y.-J. Chang, S.-Y. Yang, Y.-C. Kuo, Y.-H. Su, Y.-S. Chen, K.-C. Huang, C.-I Wu, and D.-L. Deng, "Pulse-Width and Temperature Effect on the Switching Behavior of an Etch-Stop-On-MgO-Barrier Spin-Orbit Torque MRAM Cell," IEEE Electron Device Letters 39, 1306 (2018).

 

T.-Y. Tsai, T.-Y. Chen, C.-T. Wu, H.-I Chan, C.-F. Pai*, "Spin-orbit torque magnetometry by wide-field magneto-optical Kerr effect," Scientific Reports 8, 5613 (2018).

 

T.-C. Wang, T.-Y. Chen*, C.-T. Wu, H.-W. Yen, and C.-F. Pai*, "Comparative Study on Spin-Orbit Torque Efficiencies from W/ferromagnetic and W/ferrimagnetic Heterostructures," Physical Review Materials 2, 014403 (2018).

 

 

2017

 

T.-Y. Chen, T.-C. Chuang, S.-Y. Huang, H.-W. Yen, and C.-F. Pai*, "Spin-orbit torque from a magnetic heterostructure of high-entropy alloy," Physical Review Applied 8, 044005 (2017).

 

T.-Y. Chen, C.-T. Wu, H.-W. Yen, and C.-F. Pai*, "Tunable spin-orbit torque in Cu-Ta binary alloy heterostructures," Physical Review B 96, 104434 (2017).

 

C. O. Avci, A. Quindeau, M. Mann, C.-F. Pai, C. A. Ross, and G. S. D. Beach, "Spin transport in as-grown and annealed thulium iron garnet/platinum bilayers with perpendicular magnetic anisotropy,"  Physical Review B 95, 115428 (2017)

 

 

2016

 

K. Ueda, M. Mann, C.-F. Pai, A. J. Tan, and G. S. D. Beach, "Spin-orbit torques in Ta/TbxCo100-x ferrimagnetic alloy films with bulk perpendicular magnetic anisotropy," Applied Physics Letters 109, 232403 (2016).

 

C. O. Avci, A. Quindeau, C.-F. Pai, M. Mann, L. Caretta, A. S. Tang, M. C. Onbasli, C. A. Ross, and G. S. D. Beach, "Current-Induced Switching in a Magnetic Insulator," Nature Materials 16, 309 (2016).

 

Y. Ou, C.-F. Pai, S. Shi, D. C. Ralph, and R. A. Buhrman, "Origin of fieldlike spin-orbit torques in heavy metal/ferromagnet/oxide thin film heterostructures," Physical Review B 94, 140414(R) (2016). (Rapid Communication)

 

K. Ueda, C.-F. Pai, A. J. Tan, M. Mann, and G. S. D. Beach, "Effect of rare earth metal on the spin-orbit torque in magnetic heterostructures," Applied Physics Letters 108, 232405 (2016).

 

C.-F. Pai*, M. Mann, A. J. Tan, and G. S. D. Beach, “Determination of Spin Torque Efficiencies in Heterostructures with Perpendicular Magnetic Anisotropy,” Physical Review B 93, 144409 (2016). (Editor's Suggestion)

 

K. An, X. Ma, C.-F. Pai, J. Yang, K. S. Olsson, J. L. Erskine, D. C. Ralph, R. A. Buhrman, and X. Li, “Current Control of Magnetic Anisotropy via Stress in a Ferromagnetic Metal Waveguide,” Physical Review B 93, 140404(R) (2016). (Rapid Communication / Editor's Suggestion)

 

 

Older works

 

M.-H. Nguyen, C.-F. Pai, K. X. Nguyen, D. A. Muller, D. C. Ralph, and R. A. Buhrman, “Enhancement of the anti-damping spin torque efficacy of the spin Hall effect in Pt by interface modification,” Applied Physics Letters 106, 222402 (2015).

 

C.-F. Pai, Y. Ou, L. H. V.-Leão, D. C. Ralph, and R. A. Buhrman, “Dependence of the Efficiency of Spin Hall Torque on the Transparency of Pt-Ferromagnetic Layer Interfaces,” Physical Review B 92, 064426 (2015). (Editor's Suggestion)

 

C.-F. Pai, M.-H. Nguyen, C. Belvin, L. H. V.-Leão, D. C. Ralph, and R. A. Buhrman, “Enhancement of perpendicular magnetic anisotropy and transmission of spin-Hall-effect-induced spin currents by a Hf spacer layer in W/Hf/CoFeB/MgO layer structures,” Applied Physics Letters 104, 082407 (2014).

 

O. J. Lee, L. Q. Liu, C.-F. Pai, Y. Li, H. W. Tseng, P. G. Gowtham, J. Park, D. C. Ralph, and Robert A. Buhrman, “The central role of domain wall depinning for perpendicular magnetization switching driven by spin torque from the spin Hall effect,” Physical Review B 89, 024418 (2014). (Editor's Suggestion)

 

K. An, D. R. Birt, C.-F. Pai, K. Olsson, D. C. Ralph, R. A. Buhrman, and X. Li, “Control of propagating spin waves via spin transfer torque in a metallic bilayer waveguide,” Physical Review B 89, 140405(R) (2014). (Rapid Communication)

 

L. Q. Liu, C.-F. Pai, D. C. Ralph, and R. A. Buhrman, “Gate voltage modulation of spin-Hall-torque-driven magnetic switching,” arXiv:1209.0962 (2012).

 

L. Q. Liu, C.-F. Pai, D. C. Ralph, and R. A. Buhrman, “Magnetic oscillations driven by the spin Hall effect in 3-terminal magnetic tunnel junction devices,” Physical Review Letters 109, 186602 (2012).

 

C.-F. Pai*, L. Q. Liu, Y. Li, H. W. Tseng, D. C. Ralph, and R. A. Buhrman, “Spin transfer torque devices utilizing the giant spin Hall effect of tungsten,” Applied Physics Letters 101, 124404 (2012).

 

L. Q. Liu, C.-F. Pai, Y. Li, H. W. Tseng, D. C. Ralph, and R. A. Buhrman, “Spin-torque switching with the giant spin Hall effect of tantalum,” Science 336, 555 (2012).

Books

Denny D. Tang and Chi-Feng Pai, Magnetic Memory Technology: Spin-Transfer Torque MRAM and Beyond, Wiley-IEEE Press, 1st Edition (January 7, 2021).

Patents

"Circuits and devices based on enhanced spin hall effect for efficient spin transfer torque": US10008248B2 (Issued: June 26, 2018). Inventors: Robert A. Buhrman, Minh-Hai  Nguyen, Chi-Feng Pai, Daniel C. Ralph.

 

“Electrically gated three-terminal circuits and devices based on spin hall torque effects in magnetic nanostructures apparatus, methods and applications”: US9230626B2 (Issued: January 5, 2016). Inventors: Robert A. Buhrman, Daniel C. Ralph, Chi-Feng Pai, Luqiao Liu.

 

“Spin hall effect magnetic apparatus, method and applications”: US9105832B2 (Issued: August 11, 2015). Inventors: Robert A. Buhrman, Daniel C. Ralph, Luqiao Liu, Chi-Feng Pai.

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