seminar – Free electrons travelling in a uniformly rotating magnetic field

On Monday April 8th, we have the pleasure to welcome in SPINTEC Prof. José Luis PRIETO MARTIN from ISOM-Universidad Politécnica de Madrid. He will give us a seminar at 14:00 entitled :
Free electrons travelling in a uniformly rotating magnetic field

Place : IRIG/SPINTEC, auditorium 445 CEA Building 10.05 (access to CEA requires an entry authorization. Request it before March 28th at

video conference :
IF THE LINK DOES NOT WORK, try with skype web App :
or by phone +33 1 69 35 55 10 conf ID : 42484906

Abstract : A phosphor screen is often used to image the incidence of a beam of electrons. In many cases, the luminosity obtained on the screen can be a quantitative measurement of the beam current or even of its energy. The situation is much more complex when the electron beam travels in the presence of a static magnetic field. In this talk, we will discuss the particularities of a beam of free electrons travelling under two perpendicular magnetic fields. The first one is axial, oriented in the direction of the travelling electrons. The second one is perpendicular to the direction of travel of the electrons and rotates uniformly 180º within a few centimetres (like a ‘virtual’ magnetic domain wall few centimetres wide). With the help of COMSOL simulations, by fitting the position and shape of the luminous spot on the phosphor screen, we will visualize the trajectory of the electrons and the effect of the electron-electron electrostatic interactions within the beam. Although we will talk mostly about the charge of the electron, at the end, we will give a ‘spin’ to the talk, so everyone feels more at home.

Biography : I got the PhD at the Polytechnic University of Madrid. The went for 5 years to Cambridge University UK, first as a Marie-Curie Individual fellow and then as a Research Associate. I got awarded a Spanish “Ramón y Cajal” contract to go back to Spain and I joined the newly stablished Institute for Optoelectronic Systems and Microtechnology (ISOM) of the Polytechnic University of Madrid, an institute that was fully dedicated to semiconductor technology but where I now lead a small group dedicated mostly to applied magnetism. Our activity has been traditionally dedicated to industrial needs related to magnetism (magnetic sensors, detection of devices, mapping local magnetic fields, designing magnetic equipment or fabricating magnetic tags). In the last 15 years we have diverted some of our activity to spintronic devices, mainly exploring the movement of magnetic domain walls under the action of currents and surface acoustic waves. I have supervised 8 PhDs and I teach general physics and magnetic and thermal properties of materials to undergrad students. I have been academic secretary of our Institute for four years and coordinator of the largest degree in the University for another four years… a ‘never again’ experience.

ISOM : Institute for Optoelectronic Systems and Microtechnology


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