Magnetoelectronic components comprise at least one oblong working structure made of a ferromagnetic material, along which magnetic domain walls can migrate, means for applying an electric current to this working structure, and at least one magnetic field sensor for the magnetic field generated by the working structure. The working structure is designed so that it is able to form domain walls, the transverse magnetization direction of which in the center has no preferred direction in the plane perpendicular to the migration direction thereof along the working structure, and/or can form massless domain walls. It was found that the kinetic energy of such moving domain walls vanishes. These walls are thus not subject to the Walker limit nor to intrinsic pinning. As a result, the components can read, store or process and finally output information more quickly. The invention also relates to a method for measuring the non-adiabatic spin transfer parameter of a ferromagnetic material. This method was developed as part of a more in-depth examination of the phenomena that were found.

A device that is capable of generating a new test pattern after the design phase and has a small area of a circuit not in use during normal operation includes a first circuit and a second circuit. The second circuit includes a third circuit and fourth circuit. The fourth circuit has a function of storing data for determining the configuration of the third circuit. When a test for the operating state of the first circuit is performed, the second circuit has a function of generating a signal for the test. When the test is not performed, the second circuit has a function of storing data used for processing in the first circuit and a function of comparing a plurality of signals.