Magnetic properties of NdFeB thin films synthesized via laser ablation processing

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Abstract
High energy product Nd2Fe14B films have been grown onto Si(100) substrate by KrF pulsed laser ablation using the targets of NdxFe90.98−xB9.02 (x=17.51–27.51). The films exhibit no preferred texture, however, good hard magnetic properties were produced from as-deposited condition: 4πMs≃7 kG, 4πMr≃4 kG, and Hc=300–1000 Oe. The beam density of 3 J/cm2 gave the optimal condition to have the highest 4πMr and Hc for a substrate T of 650 °C. The higher content of Nd induces a higher coercivity and 4πMr at the same time without prominent change in 4πMs. The films grown at elevated temperature (620–700 °C) are understood to suggest a magnetically coupled interaction between Nd2Fe14B and α-Fe grains by taking into account the monotonously decreasing 4πMr values accompanying with a broad peak regime in Hc at around 550–625 °C.