Direct dynamic imaging of non-adiabatic spin torque effects

Non-adiabatic Laser Induced Spin Coupling Phenomena

remaining a pure state. Mixing coefficients are given by a and b with a + b = 1. When allowed external Zeeman or Stark interactions are switched on, which exceed the internal interaction energy C, then states |l'> and |2'> become pure basis states |l> and |2> respectively as a •*• 1 and b * 0. This problem is solved for four levels explictly in ref. 1 for the case of spin-rotation interaction i...

A Novel Dynamic Overmodulation Strategy of Direct Torque Control

The direct torque control-space vector modulation (DTC-SVM) is well-known for achieving excellent dynamic overmodulation. However, the method uses complicated predictive stator flux vector control and requires high precision stator flux vector to define overmodulation mode. This paper proposes a straightforward dynamic overmodulation method and constant switching frequency controller without SV...

Electronic transport through domain walls in ferromagnetic nanowires:Co-existence of adiabatic and non-adiabatic spin dynamics

Spin-torque building blocks.

The discovery of the spin-torque effect has made magnetic nanodevices realistic candidates for active elements of memory devices and applications. Magnetoresistive effects allow the read-out of increasingly small magnetic bits, and the spin torque provides an efficient tool to manipulate - precisely, rapidly and at low energy cost - the magnetic state, which is in turn the central information m...

Non Adiabatic Effects and Radiationless Transitions

Ab-initio methods for computing stationary molecular states and radiationless transition probabilities between nonstationary states are discussed. The expansion methods, the molecular Hamiltonians, the adiabatic and dia-batic representations, and the symmetry properties are briefly discussed. As an example, nonadiabatic effects in the V-N spectrum of C2H4 and corresponding V-R, · radiationless ...