M - EPFL moodle service
... This means that not only does it retain its memory with the power turned off but also there is no constant power-draw much lower power consumption (up to 99% less) compared to DRAM However, with storage density and capacity orders of magnitude smaller than an hard disk (HDD), MRAM is useful in appli ...
... This means that not only does it retain its memory with the power turned off but also there is no constant power-draw much lower power consumption (up to 99% less) compared to DRAM However, with storage density and capacity orders of magnitude smaller than an hard disk (HDD), MRAM is useful in appli ...
dual-valent
... of charge distribution known as charge ordering (CO). Although covalence effects in such compounds can be significant, the ionic picture describes it as a real-space ordering of charges and/or orbitals. In general, the Coulomb repulsion between the charges and the elastic energy perturbation owing t ...
... of charge distribution known as charge ordering (CO). Although covalence effects in such compounds can be significant, the ionic picture describes it as a real-space ordering of charges and/or orbitals. In general, the Coulomb repulsion between the charges and the elastic energy perturbation owing t ...
Spin-liquids
... Slave Particle approach to itinerant non-Fermi liquids Decompose the electron: spinless charge e boson and s=1/2 neutral fermionic spinon, ...
... Slave Particle approach to itinerant non-Fermi liquids Decompose the electron: spinless charge e boson and s=1/2 neutral fermionic spinon, ...
Resonant tunnelling through a single level with non-collinear magnetizations
... Transport of spin-polarized electrons through quantum dots coupled to ferromagnetic leads is currently of interest due to possible applications in magnetoelectronic and spintronic devices [1–3]. This applies especially to spin valve structures, where the transition from parallel to antiparallel magn ...
... Transport of spin-polarized electrons through quantum dots coupled to ferromagnetic leads is currently of interest due to possible applications in magnetoelectronic and spintronic devices [1–3]. This applies especially to spin valve structures, where the transition from parallel to antiparallel magn ...
On the computational complexity of Ising spin glass models
... This fact suggests to us to work in the dual graph G*. Vertices of G* will be called ‘odd’ and ‘even’ depending whether they represent a frustrated or unfrustrated face respectively. Odd (even) vertices must have an odd (even) number of unsatisfied edges adjacent to them. Now we will describe how to ...
... This fact suggests to us to work in the dual graph G*. Vertices of G* will be called ‘odd’ and ‘even’ depending whether they represent a frustrated or unfrustrated face respectively. Odd (even) vertices must have an odd (even) number of unsatisfied edges adjacent to them. Now we will describe how to ...
Magnetic Resonance Imaging Physics and Instrumentation
... spins tipped into the transverse plane can induce a signal. • RF coils are used to receive the MR signal. ...
... spins tipped into the transverse plane can induce a signal. • RF coils are used to receive the MR signal. ...
The Persistent Spin Helix
... Physical Picture: Persistent Spin Helix • Spin configurations do not depend on the particle initial momenta. • For the same x distance traveled, the spin precesses by exactly the same angle. • After a length L 2 Q the spins all return exactly to the original configuration. ...
... Physical Picture: Persistent Spin Helix • Spin configurations do not depend on the particle initial momenta. • For the same x distance traveled, the spin precesses by exactly the same angle. • After a length L 2 Q the spins all return exactly to the original configuration. ...
Atomic-scale Magnetism on a Complex Surface
... Barbara Jones is the head of the Theoretical and Computational Physics Group at IBM’s Almaden Research Center in San Jose, California. Prior to holding this position, she was Manager of Magnetic Materials and Phenomena at IBM. She received her PhD from Cornell University. Dr. Jones’s research inte ...
... Barbara Jones is the head of the Theoretical and Computational Physics Group at IBM’s Almaden Research Center in San Jose, California. Prior to holding this position, she was Manager of Magnetic Materials and Phenomena at IBM. She received her PhD from Cornell University. Dr. Jones’s research inte ...
Local doc file
... Spin transfer torques O. Sukhostavets A ferromagnetic material such as iron has permanent magnetization when the magnetic moments of its atoms are aligned parallel to each other. Because individual electrons also have an intrinsic alignment of their own angular moments (spins), they can interact wit ...
... Spin transfer torques O. Sukhostavets A ferromagnetic material such as iron has permanent magnetization when the magnetic moments of its atoms are aligned parallel to each other. Because individual electrons also have an intrinsic alignment of their own angular moments (spins), they can interact wit ...
Chapter 1 Basic classical statistical mechanics of lattice spin systems
... even if it’s easier to formulate a given model on the lattice, why not pass to a continuum formulation as quickly as possible, and then take advantage of the vast amount of tools of field theory? In some situations, the answer is simply that one indeed can analyze the problem thoroughly using field ...
... even if it’s easier to formulate a given model on the lattice, why not pass to a continuum formulation as quickly as possible, and then take advantage of the vast amount of tools of field theory? In some situations, the answer is simply that one indeed can analyze the problem thoroughly using field ...
Geometrical frustration
In condensed matter physics, the term geometrical frustration (or in short: frustration) refers to a phenomenon, where atoms tend to stick to non-trivial positions or where, on a regular crystal lattice, conflicting inter-atomic forces (each one favoring rather simple, but different structures) lead to quite complex structures. As a consequence of the frustration in the geometry or in the forces, a plenitude of distinct ground states may result at zero temperature, and usual thermal ordering may be suppressed at higher temperatures. Much studied examples are amorphous materials, glasses, or dilute magnets.The term frustration, in the context of magnetic systems, has been introduced by Gerard Toulouse (1977). Indeed, frustrated magnetic systems had been studied even before. Early work includes a study of the Ising model on a triangular lattice with nearest-neighbor spins coupled antiferromagnetically, by G. H. Wannier, published in 1950. Related features occur in magnets with competing interactions, where both ferro- as well as antiferromagnetic couplings between pairs of spins or magnetic moments are present, with the type of interaction depending on the separation distance of the spins. In that case commensurability, such as helical spin arrangements may result, as had been discussed originally, especially, by A. Yoshimori, T. A. Kaplan, R. J. Elliott, and others, starting in 1959, to describe experimental findings on rare-earth metals. A renewed interest in such spin systems with frustrated or competing interactions arose about two decades later, beginning in the 70s of the 20th century, in the context of spin glasses and spatially modulated magnetic superstructures. In spin glasses, frustration is augmented by stochastic disorder in the interactions, as may occur, experimentally, in non-stoichiometric magnetic alloys. Carefully analyzed spin models with frustration include the Sherrington-Kirkpatrick model, describing spin glasses, and the ANNNI model, describing commensurability magnetic superstructures.