Valley filter in strain engineered graphene

We propose a simple, yet highly efficient and robust device for producing valley polarized current in graphene. The device comprises of two distinct components; a region of uniform uniaxial strain, adjacent to an out-of-plane magnetic barrier configuration formed by patterned ferromagnetic gates. We show that when the amount of strain, magnetic field strength, and Fermi level are properly tuned, the output current can be made to consist of only a single valley contribution. Perfect valley filtering is achievable within experimentally accessible parameters.Comment: 4 pages, 3 figures; minor corrections, updated Figs. 2 and 3, added reference

Time Quantified Monte Carlo Algorithm for Interacting Spin Array Micromagnetic Dynamics

In this paper, we reexamine the validity of using time quantified Monte Carlo (TQMC) method [Phys. Rev. Lett. 84, 163 (2000); Phys. Rev. Lett. 96, 067208 (2006)] in simulating the stochastic dynamics of interacting magnetic nanoparticles. The Fokker-Planck coefficients corresponding to both TQMC and Langevin dynamical equation (Landau-Lifshitz-Gilbert, LLG) are derived and compared in the presence of interparticle interactions. The time quantification factor is obtained and justified. Numerical verification is shown by using TQMC and Langevin methods in analyzing spin-wave dispersion in a linear array of magnetic nanoparticles.Comment: Accepted for publication in Phys. Rev.

Pelatihan Pengembangan Materi Ajar dalam Bentuk Media Power Point pada Materi Struktur Luar Tumbuhan

The challenge of the 21st century is how teachers as much as possible integrate learning with information technology. Lecturers often find slides prepared by students when the presentation is not good, for example: full text and not contrast. The purpose of this study is to explain how the implementation, response, constraints, and difficulties during the development of materials in the form of a powerpoint slide on the material outside the plant structure. The research approach is based on qualitative research. Data obtained from questionnaires, interviews, and observations on PGMI students Semester 4 academic year 2017/2018. Data analysis using Miles and Haberman version. The results showed that the implementation of the training through three stages of pre-training, training and evaluation. Training includes 10 menus, namely: making titles, core competencies, basic competencies, indicators, concept maps, aperception, sub material outside structure in plants, insert windows media player, practice questions, and compile learning resources. All the trainees were pleased with the material development training through the presentation slides, 75% said they were useful, and 87.25% said Powerpoint training was something new. The material difficulties faced by students are 50% in the form of structure and content, 25% are Powerpoint templates, 12.5% difficulties create hyperlinks and insert windows video player. Technical obstacles faced in general are 62.5% in the form of time settings, 25% HR, and 12,% laptop supplies are limited

Non-equilibrium spatial distribution of Rashba spin torque in ferromagnetic metal layer

We study the spatial distribution of spin torque induced by a strong Rashba spin-orbit coupling (RSOC) in a ferromagnetic (FM) metal layer, using the Keldysh non-equilibrium Green's function method. In the presence of the s-d interaction between the non-equilibrium conduction electrons and the local magnetic moments, the RSOC effect induces a torque on the moments, which we term as the Rashba spin torque. A correlation between the Rashba spin torque and the spatial spin current is presented in this work, clearly mapping the spatial distribution of Rashba Spin torque in a nano-sized ferromagnetic device. When local magnetism is turned on, the out-of-plane (Sz) Spin Hall effect (SHE) is disrupted, but rather unexpectedly an in-plane (Sy) SHE is detected. We also study the effect of Rashba strength (\alpha_R) and splitting exchange (\Delta) on the non-equilibrium Rashba spin torque averaged over the device. Rashba spin torque allows an efficient transfer of spin momentum such that a typical switching field of 20 mT can be attained with a low current density of less than 10^6 A/cm^2

Who Receives More Family Related Support in the Workplace? A Meta-Analysis of Gender Differences in Family Related Support

The purpose of the current study was to meta-analytically estimate if gender differences exist in the provision of family related support in the workplace. Gender differences are of particular interest in the realm of family related support in the workplace because they lie at the intersection of prescribed gender roles for both men and women at home and work. Family related support plays an integral role in an employees’ willingness to utilize family friendly policies that organizations provide to meet the increasing needs of employees to balance work and family demands. Though it may seem like a simple research question, theoretical models provide conflicting predictions on the presence of gender differences and the empirical evidence is inconsistent. Hunter and Schmidt’s (2004) meta-analytical procedures were employed to test for the presence of gender differences in family related support and potential moderators. Results indicate that female employees receive significantly more family related support than male employees in the workplace. Additionally, significant moderators of the gender difference were GDP, unemployment rate, masculinity, and time orientation. Theoretical and practical implications regarding the role that gender roles play in support and work-family conflict are discussed