Abstract: A method of manufacturing a device with a magnetic layer-structure is disclosed, the method comprising the steps of:—forming the magnetic layer-structure (2),—heating the magnetic layer-structure with an electric current, wherein the electric current is a pulse (3) having a duration such that no substantial heat transfer from the layer-structure to the environment (4) of the layer-structure takes place, so that the temperature of said environment before and after the current pulse is substantially the same. Heat is substantially dissipated in the layer-structure. The method therefore allows the selection of physical processes in the layer-structure in order to optimize the magnetic or electrical characteristic of the magnetoresistive device, without disturbing the environment such as neighboring devices.

Abstract: An electronic circuit comprising means (CMNS) for controlling a current (IL) through a coil (L) for the generation of a magnetic field (H). The means (CMNS) comprise means (DMNS) for the determination of a parameter which is a measure for the value of the resistance (RL) of the coil (L). During operation the maximum absolute value of the current (IL) is decreased when the parameter exceeds a certain limit.