Hydrothermal synthesis of HoMn2O5 nanorods and their size-dependent magnetic properties

The HoMn 2 O 5 nanorods were synthesized by a surfactant-assisted hydrothermal process. The length of nanorods is readily controllable with basically constant diameter. HoMn 2 O 5 nanorods show recognizable divagation at T N (Ho) of 13 K between FC and ZFC curve due to the contribution of the magnetic ordering of holmium . Size-dependent magnetic properties (i.e. a critical length for magnetization) of HoMn 2 O 5 nanorods can be ascribed to the competition between surface strain and uncompensated spin at the surface.