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MMM 2022

November 07, 2022

Minneapolis, United States

Effect of laser power on structural and magnetic properties of anisotropic Nd Fe

Anisotropic rare-earth thick-film magnets have various applications such as MEMS (Micro Electro Mechanical Systems) devices and miniaturized electronic devices1. We have already fabricated anisotropic rare-earth film magnets by the substrate heating3. In the substrate heating process, increasing the deposition time might cause the grain size of Nd-Fe-B to increase. Our approach to anisotropic Nd-Fe-B thick-film magnets is to make them by increasing laser beam power for high deposition rate. This contribution reports the effect of laser power on several properties of anisotropic Nd-Fe-B film magnets using PLD method. A rotated Nd-Fe-B target was ablated using an Nd-YAG pulse laser. The laser beam power was set at 2-4 W. During deposition, a Ta substrate was heated by Joule heating utilizing electric current through the substrate. J-H loops were measured with a vibrating sample magnetometer (VSM). The perpendicular loops were corrected by using the demagnetization factor of 0.8. Figure 1 shows J-H loops of the Nd-Fe-B films deposited at each laser power. The films had the easy direction of magnetization in the plane of the perpendicular. The residual magnetic polarization ratio is defined by Jrper / Jrin , where Jrper and Jrin are the residual magnetic polarization values out-of-plane and in-plane direction, respectively. Jrper / Jrin ratio suggests that the decreasing laser power puts the easy direction of magnetization out-of-plane of the film. Figure 2 shows X-ray diffraction patterns of samples deposited by 2 W and 4 W. The peak intensities corresponding to the c-axis prepared by laser beam power at 2 W were stronger than those for 4 W. As the relative intensity ratio of (006) / (105) increase with the decreasing laser beam power {4 W : 0.8 , 2 W : 1.3} , the increase in intensity ratio is consistent with the increase in the Jrper / Jrin value. Although it was difficult to prepare anisotropy Nd-Fe-B films with high deposition rate, we found that the crystalline texture for the Nd-Fe-B film magnets depends on the laser power.
1 P. Mcguiness, D. Jezeršek, S. Kobe, J. Magn. Magn. Mater., vol. 305, no. 1, pp. 177–181 (2006).
2 R. Fujiwara, T. Shinshi, and M. Uehara, Int. J. Automot. Technol., vol. 7, no. 2, pp. 148–155 (2013).
3 M. Nakano, S. Tsutsumi, T. Yanai, J. Appl. Phys., vol. 105, Issue 7, pp. 07A739-07A742 (2009).
4 Y. Furukawa, H. Koga, T. Yanai , IEEE Magn. Lett. , vol. 8, #5502104 (2017).

Next from MMM 2022

Investigation on crystallization process in isotropic rare earth rich (Nd or Pr)

Investigation on crystallization process in isotropic rare earth rich (Nd or Pr)

MMM 2022

Itsuki Fukuda and 5 other authors

07 November 2022

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