Аннотация:Partial cycles of magnetization-reversal are investigated experimentally in permanent magnets made from neodymium-iron-boron and samarium-zirconium-cobalt-iron-copper alloys. The causes responsible for the width of the partial return cycles are established. The influence of the heat-treatment conditions on the coercive force and on the shape of the return curves is studied. The domain stucture and microstructure of powdered magnets made from these alloys are investigated.