Abstract
Ho 2Fe 14B belongs to the hard magnetic material series and, like the prototype neodymium compound, exhibits a spin reorientation transition phenomenon. An accurate neutron diffraction experiment performed on a single crystal allows us to establish the exact low temperature non-collinear magnetic structure. Moreover, a lower crystal symmetry (space group Cm) is shown to occur far above T = 58 K, the spin reorientation transition. The previously reported tetragonal symmetry (space group P4 2/ mnm) can be regarded as a reasonable approximation at room temperature. High magnetostrictive forces and negative Ho-Ho interactions make possible such a crystal and magnetic symmetry lowering that is complicated by the low temperature easy axis reorientation induced by high order CEF terms.
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