ROTATIONAL HYSTERESIS ENERGY IN Nd15Fe77B8 MAGNET WITH DIFFERENT CRYSTALLOGRAPHIC ORIENTATION OF THE SAMPLE SURFACE J. J. Wysòcki, B. Szafraska-Miller, B. Wysocki, D. Pusa et R. Pfranger J. Phys. Colloques, 49 C8 (1988) C8-647-C8-648 DOI: 10.1051/jphyscol:19888293