Effect of hydrogen on the magnetic characteristicsof Nd2Fe14B single crystal

Magnetic characteristics of the Nd 2 Fe 14 BH x single crystals and polycrystalline samples were investigated in the temperature range 4.2-750 K. It is established that hydrogen absorption does not change the crystal structure of these compounds but is accompanied by an expansion of a unit cell volume. The obtained data show that the Curie temperature and magnetic moment are increasing in the all investigated hydrides whereas the temperatures of a spin-reorientation transition remain unchanged.