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Two Extreme Cases for Spin (2015-9)
来源：admin 发布时间：2016-05-17
Title: Two Extreme Cases for Spin Orbit Coupling
Time: 12/7/2015-15:00
Location: M253
Reporter: Prof. Wei Han
Peking University
Abstract:
The spin-orbit coupling is at the heart of efforts for spintronics, which aims to use spin for information storage and logic applications. There are two extreme cases for it, namely low spin orbit coupling and large spin orbit coupling.
For materials with low spin orbit coupling such as graphene, they could be used as a spin channel with long spin lifetime and spin diffusion length. In this talk, I will describe experimental observation of long spin lifetime and spin diffusion length in graphene, which are already much better than conventional metals and semiconductors at room temperature [1].
For materials with large spin orbit coupling such as platinum (Pt), a pure spin current could be generated via the spin Hall effect and lead to spin orbit torques that can largely manipulate the magnetization of FM films. In this talk, two recent experimental results will be discussed: the role of the interface transparency for efficient spin orbit torque at Platinum-ferromagnet interfaces [2] and the facet-dependent giant spin Hall effect in single crystalline antiferromagnetic Iridium-Manganese [3].
Reporter’s introduction
Han Wei : Quantum Materials Science Center of Peking University Professor, doctoral tutor. Get an undergraduate degree from the University of Science and Technology of China in 2006. Obtained University of California, Riverside doctorate in physics in January 2012. In January 2012 joined IBM Almaden Research Center Stuart Parkin group . get the entry of Quantum Material Science Center of Peking University in September 2014 , get the Central Organization Department selected young people plan in 2015. Research covers many fronts condensed matter physics , including spintronics , quantum of new materials, and molecular beam epitaxy . On the Nature Physics, Nature Nanotechnology, Nature Communication, Physical Review Letters, Nano Letters and other well-known international journals published more than 30 scientific papers cited more than 1600 times .
Reference
[1] Wei Han, R. K. Kawakami, Martin Gmitra, and Jaroslav Fabian, “Graphene spintronics”, Nature Nanotechnology, 9, 794-807 (2014).
[2] W. Zhang*, Wei Han*, Xin Jiang, See-Hun Yang, Stuart Parkin, “Role of transparency of platinum–ferromagnet interfaces in determining the intrinsic magnitude of the spin Hall effect”, Nature Physics 11, 496–502 (2015).
[3] W. Zhang*, Wei Han*, See-Hun Yang, Stuart Parkin, “Facet-dependent giant spin Hall effect in single crystalline antiferromagnetic Ir-Mn”, under review, Nature Materials.
Contact Person:Young Sun(9088)
Time: 12/7/2015-15:00
Location: M253
Reporter: Prof. Wei Han
Peking University
Abstract:
The spin-orbit coupling is at the heart of efforts for spintronics, which aims to use spin for information storage and logic applications. There are two extreme cases for it, namely low spin orbit coupling and large spin orbit coupling.
For materials with low spin orbit coupling such as graphene, they could be used as a spin channel with long spin lifetime and spin diffusion length. In this talk, I will describe experimental observation of long spin lifetime and spin diffusion length in graphene, which are already much better than conventional metals and semiconductors at room temperature [1].
For materials with large spin orbit coupling such as platinum (Pt), a pure spin current could be generated via the spin Hall effect and lead to spin orbit torques that can largely manipulate the magnetization of FM films. In this talk, two recent experimental results will be discussed: the role of the interface transparency for efficient spin orbit torque at Platinum-ferromagnet interfaces [2] and the facet-dependent giant spin Hall effect in single crystalline antiferromagnetic Iridium-Manganese [3].
Reporter’s introduction
Han Wei : Quantum Materials Science Center of Peking University Professor, doctoral tutor. Get an undergraduate degree from the University of Science and Technology of China in 2006. Obtained University of California, Riverside doctorate in physics in January 2012. In January 2012 joined IBM Almaden Research Center Stuart Parkin group . get the entry of Quantum Material Science Center of Peking University in September 2014 , get the Central Organization Department selected young people plan in 2015. Research covers many fronts condensed matter physics , including spintronics , quantum of new materials, and molecular beam epitaxy . On the Nature Physics, Nature Nanotechnology, Nature Communication, Physical Review Letters, Nano Letters and other well-known international journals published more than 30 scientific papers cited more than 1600 times .
Reference
[1] Wei Han, R. K. Kawakami, Martin Gmitra, and Jaroslav Fabian, “Graphene spintronics”, Nature Nanotechnology, 9, 794-807 (2014).
[2] W. Zhang*, Wei Han*, Xin Jiang, See-Hun Yang, Stuart Parkin, “Role of transparency of platinum–ferromagnet interfaces in determining the intrinsic magnitude of the spin Hall effect”, Nature Physics 11, 496–502 (2015).
[3] W. Zhang*, Wei Han*, See-Hun Yang, Stuart Parkin, “Facet-dependent giant spin Hall effect in single crystalline antiferromagnetic Ir-Mn”, under review, Nature Materials.
Contact Person:Young Sun(9088)