The Landau-Lifshitz-Gilbert equation
To model the motion of the magnetization in the time domain, the Landau-Lifshitz (LL) equation is used. It describes the evolution in time of the magnetization in a solid.
Einstein, Politics and Science
The first world war (WWI) started in august 2014, and the German army proceeded very fast through Belgium. This rapid progression created a problem in the cities that were already captured, as the main army moved on to other locations. Harsh measures were taken to avoid any kind of resistance. ...
History of Physics (1895 – 1945)
Physics has always been an interesting topic, but it was during a span of only 50 years that physics completely changed the world. The movie "Oppenheimer" showed in great detail the history of what happened and how they got to the atomic bomb. But this is only part of the ...
What are thyristors and how do they work?
In this article I will discuss what thyristors are and how they work. I will start with the semiconductor structure of a thyristor and use the characteristic V-I curve to explain the three different modes. Subsequently, I will use an two transistor model to explain the thyristor from a different ...
3-phase IGBT-inverter – Working principles
In this article the 3-phase IGBT inverter and its functional operation are discussed. In order to realize the 3-phase output from a circuit employing dc as the input voltage, a 3-phase (IGBT) inverter has to be used. The inverter is build of switching devices, thus the way in which the ...