New possibilities of synchrotron radiation diffraction topography for the investigation of 'exotic' magnetic domains

Synchrotron radiation topography on modern sources, coupled with adequate C CD detectors, is producing (in a shorter time and with better resolution) r esults which could only be obtained, up to now, by using neutron topography . This is shown by two examples, carried out at the ESRE on 'exotic' antife rromagnetic domains: (1) the imaging of 180 degrees antiferromagnetic domai ns in cobalt fluoride is performed using the inverse piezomagnetic effect: the action of a magnetic field while cooling and 'memory' effects are inves tigated in this way, and (2) the spin density wave domains in chromium are observed using their associated, weak, charge density wave peaks: the impor tance of the surface effects to determine the domain type is evidenced.