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The laser spot size can be adjusted to the order of mm, which is convenient for annealing small samples. The infrared lasers of CWLD with a wavelength of about 1 μm can rapidly heat up the material to be irradiated by resonant absorption and have a fast cooling rate. In contrast, continuous wave laser diode, CWLD, have the advantage of being very low cost, although they cannot be pulsed like excimer lasers. However, excimer laser sources are very expensive and are used for special applications requiring non-thermal processing. The emergence of hard magnetism with large perpendicular coercivity has been reported in Nd-Fe-B thin films of 2 μm thickness irradiated with KrF excimer pulses. This is one of the methods to form magnetic thin films which can give excellent magnetic properties while maintaining high film surface flatness.Īmong them, the KrF excimer laser pulses with wavelength λ of 248 nm, which are selected as a high energy source, can crystallize the amorphous phase in a very short time (ps order).

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PTP has been applied to a two-step method combining post-annealing with deposition below the crystallization temperature. O’Neill, in International Congress on Applications of Lasers and Electro-Optics (2011), Vol. It is known that pulse-thermal processing, PTP, has been attempted to improve the properties of Nd-Fe-B magnet films and to form Nd-Fe-B nanocomposite magnets by using various heat sources and methods for rapid heating and cooling. but also effective in reducing the use of heavy rare-earth elements, HREs. Nanocomposite magnets composed of magnetic hard phase Nd 2Fe 14B nanoparticles and magnetic soft phase α-Fe nanoparticles are not only expected to increase the maximum energy product, ( BH) max, compared to the Nd-Fe-B magnets, 1,2 1. The infrared laser annealing process crystallizes the amorphous phase of the Nd-Fe-B layer as well as the multi-step annealing, even though the infrared laser annealing process time is only 1/100 of the process time of the multi-step annealing using halogen lamps reported previously. In second quadrant, squareness of demagnetization curve of infrared laser annealing processed film with Mo interlayer was better than that of film without Mo interlayer. Coercivity of in-plane annealed film with Mo interlayer was about 10 kOe which was double that of the film without Mo interlayer. Magnetic properties of both films were drasticly changed from soft magnetism to hard magnetism with in-plane magnetic anisotropy after the infrared laser annealing process at 760☌.

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The perpendicular magnetic anisotropy of the film with Mo interlayer was larger than that of the film without Mo interlayer before annealing. The formation of nanocomposite Nd-Fe-B/Mo/FeCo multilayered magnet films using the infrared laser annealing technique.

$crystaldiffract database$

Crystaldiffract database