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The relaxation process of electron spin in systems of electrons interacting with piezoelectric deformation phonons that are mediated through spin-orbit interactions was interpreted from a microscopic point of view using the formula for the…

Mesoscale and Nanoscale Physics · Physics 2015-06-22 Nam Lyong Kang

We investigate the spin relaxation induced by acoustic phonons in the presence of spin-orbit interactions in single electron Si/SiGe lateral coupled quantum dots. The relaxation rates are computed numerically in single and double quantum…

Mesoscale and Nanoscale Physics · Physics 2015-03-17 Martin Raith , Peter Stano , Jaroslav Fabian

We investigate spin dynamics in antiferromagnetic (AF) molecular rings at finite temperature in the presence of spin-phonon (s-p) interaction. We derive a general expression for the spin susceptibility in the weak s-p coupling limit and…

Mesoscale and Nanoscale Physics · Physics 2009-11-11 Leonardo Spanu , Alberto Parola

Spin relaxation torque ${\cal T}$ in uniform metallic ferromagnets with the spin-orbit interaction arising from random impurities is calculated microscopically. ${\cal T}$ is shown to be written by spatial derivatives of the electric field,…

Mesoscale and Nanoscale Physics · Physics 2015-05-18 Noriyuki Nakabayashi , Akihito Takeuchi , Kazuhiro Hosono , Katsuhisa Taguchi , Gen Tatara

We extend our recent result for the spin-relaxation time due to acoustic electron-phonon scattering in degenerate bands with spin mixing [New J. Phys. 18, 023012 (2015)] to include interactions with optical phonons, and present a numerical…

Materials Science · Physics 2017-08-23 Svenja Vollmar , David J. Hilton , Hans Christian Schneider

There currently is a large effort to explore spin-orbit effects in semiconductor structures with the ultimate goal of manipulating electron spins with gates. A search for materials with large spin-orbit coupling is therefore important. We…

Mesoscale and Nanoscale Physics · Physics 2009-11-10 S. A. Studenikin , P. T. Coleridge , P. Poole , A. Sachrajda

We studied the diffusion and the relaxation of the polarized quasiparticle spins in superconductors. To that end, quasiparticles of polarized spins were injected through an interface of a mesoscopic superconducting Al wire in proximity…

Mesoscale and Nanoscale Physics · Physics 2012-05-28 Yun-Sok Shin , Hu-Jong Lee , Hyun-Woo Lee

Processes which flip the spin of an electron tunneling in a junction made up of magnetic electrodes are studied. It is found that: i) Magnetic impurities give a contribution which increases the resistance and lowers the magnetoresistance,…

Mesoscale and Nanoscale Physics · Physics 2009-10-30 F. Guinea

The electron spin relaxation times in a system of electrons interacting with piezoelectric phonons mediated through spin-orbit interactions were calculated using the formula derived from the projection-reduction method. The results showed…

Mesoscale and Nanoscale Physics · Physics 2015-06-22 Nam Lyong Kang

We report a measurement of the spin-flip probabilities for ultracold neutrons interacting with surfaces coated with nickel phosphorus. For 50~$\mu$m thick nickel phosphorus coated on stainless steel, the spin-flip probability per bounce was…

We have fabricated a multi terminal lateral mesoscopic metallic spin valve demonstrating spin precession at room temperature, using tunnel barriers in combination with metallic ferromagnetic electrodes as spin injector and detector. The…

Mesoscale and Nanoscale Physics · Physics 2009-11-07 F. J. Jedema , M. V. Costache , H. B. Heersche , J. J. A. Baselmans , B. J. van Wees

Electron spin relaxation due to the D'yakonov-Perel' mechanism is investigated in bilayer graphene with only the lowest conduction band being relevant. The spin-orbit coupling is constructed from the symmetry group analysis with the…

Mesoscale and Nanoscale Physics · Physics 2013-05-14 L. Wang , M. W. Wu

Spin accumulation and spin precession in single-layer graphene are studied by non-local spin valve measurements at room temperature. The dependence of the non-local magnetoresistance on electrode spacing is investigated and the results…

Mesoscale and Nanoscale Physics · Physics 2010-01-20 Wei Han , K. Pi , W. Bao , K. M. McCreary , Yan Li , W. H. Wang , C. N. Lau , R. K. Kawakami

The nature of the magnetic ground state of highly frustrated systems remained puzzling to this day. Here, we have performed multifrequency electron spin resonance (ESR) measurements on a putative quantum spin liquid compound…

In this review we discuss the multifaceted problem of spin transport in hydrogenated graphene from a theoretical perspective. The current experimental findings suggest that hydrogenation can either increase or decrease spin lifetimes, which…

We report an alternative mechanism for the physical origin of the temperature-dependent ferromagnetic relaxation of Permalloy (NiFe) thin films. Through spin-pumping experiments, we demonstrate that the peak in the temperature-dependence of…

Materials Science · Physics 2017-02-15 L. Frangou , G. Forestier , S. Auffret , S. Gambarelli , V. Baltz

We investigate spin relaxation in graphene spin valves and observe strongly contrasting behavior for single layer graphene (SLG) and bilayer graphene (BLG). In SLG, the spin lifetime ({\tau}s) varies linearly with the momentum scattering…

Materials Science · Physics 2011-08-16 Wei Han , Roland K. Kawakami

Spin relaxation in graphene is investigated in electrical graphene spin valve devices in the non-local geometry. Ferromagnetic electrodes with in-plane magnetizations inject spins parallel to the graphene layer. They are subject to Hanle…

Mesoscale and Nanoscale Physics · Physics 2011-05-05 N. Tombros , S. Tanabe , A. Veligura , C. Jozsa , M. Popinciuc , H. T. Jonkman , B. J. van Wees

Spin precession experiments in lateral spin devices are a powerful tool for probing the spin transport properties of materials. These experiments can be quantitatively described using the Bloch diffusion equation, which offers a practical…

Theory of the electron spin relaxation in graphene on the SiO$_2$ substrate is developed. Charged impurities and polar optical surface phonons in the substrate induce an effective random Bychkov-Rashba-like spin-orbit coupling field which…

Mesoscale and Nanoscale Physics · Physics 2013-05-29 C. Ertler , S. Konschuh , M. Gmitra , J. Fabian