Abstract
Spin reorientation temperature (TSR) of sintered Nd2Fe14B ingots, hydrogenation-disproportionation-desorption-recombination (HDDR) processed Nd2Fe14B powder and surfactant-assisted ball-milled ultrafine nanostructured Nd2Fe14B particles has been determined. TSR value was found to decrease from 135 K for sintered Nd2Fe14B ingot to 129 K for HDDR processed Nd2Fe14B particles of 50-200 μm size composed of ∼300 nm grains. Interestingly, TSR value was increased after surfactant-assisted (SA) ball milling of HDDR powder reaching 134 K for 1-2 μm particles and 136 K for ∼300 nm isolated single-crystalline particles. Transformation of single-crystalline particles to polycrystalline flakes after intense SA-ball milling resulted in a decrease of the TSR to a value of 128 K. A detailed crystallographic, microstructural, and magnetic investigations have been performed and the possible reasons for the variation of TSR value have been discussed.
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