About QUINST

Quantum mechanics is at the heart of our technology and economy - the laser and the transistor are quantum devices - but its full potential is far from being realized. Recent technological advances in optics, nanoscience and engineering allow experimentalists to create artificial structures or put microscopic and mesoscopic systems under new manipulable conditions in which quantum phenomena play a fundamental role.

Quantum technologies exploit these effects with practical purposes. The objective of Quantum Science is to discover, study, and control quantum efects at a fundamental level. These are two sides of a virtuous circle: new technologies lead to the discovery and study of new phenomena that will lead to new technologies.

Our group's aim is  to control and understand quantum phenomena in a multidisciplinary intersection of  Quantum Information, Quantum optics and cold atoms, Quantum Control, Spintronics, Quantum metrology, Atom interferometry, Superconducting qubits and Circuit QED and Foundations of Quantum Mechanics.

 

 

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Nikolai Kiselev, IFW-Dresden, Germany (Seminar)

When end where

12/2011

Description

2010/09/22, Nikolai Kiselev, IFW-Dresden, Germany

Place:  Sala de Seminarios del Departamento de Física Teórica e Historia de la Ciencia
Time: 12h.
Title: Magnetic ground state and magnetization reversal in synthetic metamagnets

Abstract
Antiferromagnetically coupled multilayers with perpendicular anisotropy (e.g. [Co/(Pt,Pd)]/Ru)  can be considered as synthetic metamagnets (SMs). The ground state in these systems strongly depends on the energy balance between the interlayer exchange and the dipolar interaction. Similar to bulk metamagnets, in SMs an applied magnetic field stabilizes unusual multidomain states that is metamagnetic domains.
In my talk I will present a comprehensive theoretical study of the ground state and magnetization reversal processes (MRP) in SMs. I will give a short introduction to the magnetic domain theory and detailed description of our model.
Theoretical and experimental studies revealed a rich variety of specific multidomain textures, including regular states and different types of topological magnetic defects. I will discuss peculiarities of MRP in dependence on the system parameters.