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Biography

Masaki Mizuguchi
Masaki Mizuguchi
Institute for Materials Research (IMR), Tohoku University, Japan
Title:
Novel Ordered Alloy with Large Uniaxial Magnetic Anisotropy

Abstract:

A large uniaxial magnetic anisotropy is a fascinating feature for magnetic materials because it gives birth to various intelligent functions. For instance, materials with a large uniaxial magnetic anisotropy are promising for the application to high-density magnetic storage devices since the thermal stability of magnetization is kept even in a nanometer scale. Furthermore, large uniaxial magnetic anisotropy energy (K u ) is one of the crucial matters to realize next-generation strong hard magnets. It is well known that L1 0 -ordered alloys such as FePt, CoPt, or FePd shows considerably large K u . However, they include noble metals, thus it is an indispensable subject to find a noble metal-free large magnetic anisotropy ferromagnet. It is known that iron meteorites contain L1 0 -ordered FeNi phase, so-called “tetrataenite”, which induces unique magnetic properties different from usual Fe-Ni alloys. It has been reported that L1 0 -ordered FeNi has a large K u of 1.3 × 10 7 erg/cm 3 for a bulk sample. [1] However, there have been no studies on the fabrication of L1 0 -ordered FeNi thin films. We have been trying the fabrication of L1 0 -ordered FeNi films by alternate monatomic layer deposition for a few years. [2-15] In this talk, we present a review on the recent progress of our study on L1 0 -ordered FeNi films. L1 0 -ordered FeNi films were fabricated on a MgO(001) substrate by molecular beam epitaxy. The maximum value of K u , which was estimated from magnetization curves, reached 7.0 × 10 6 erg/cm 3 . The largest order parameter, which was estimated from XRD spectra, was 0.48. K u monotonously increased with the order parameter. We also fabricated Ni/Fe superlattices with different layer thickness and investigated their magnetic properties to understand magnetic anisotropy in Ni/Fe system including L1 0 -ordered FeNi. Results of the precise analysis for the Ni/Fe superlattices and the origin of magnetic anisotropy will be discussed. 

[References] 

[1] J. Paulevé et al., J. Appl. Phys. 39, 989 (1968). 

[2] M. Mizuguchi et al., J. Appl. Phys. 107, 09A716 (2010). 

[3] M. Mizuguchi et al., J. Magn. Soc. Jpn. 35, 370 (2011). 

[4] T. Kojima, M. Mizuguchi et al., J. Phys.: Conf. Ser. 266, 012119 (2011). 

[5] M. Kotsugi, M. Mizuguchi et al., J. Phys.: Conf. Ser. 266, 012095 (2011). 

[6] T. Kojima, M. Mizuguchi et al., Jpn. J. Appl. Phys. 51, 010204 (2012). 

[7] M. Kotsugi, M. Mizuguchi et al., J. Magn. Magn. Mater. 326, 235 (2013). 

[8] T. Kojima, M. Mizuguchi et al., Surf. Sci. 326, 235 (2013). 

[9] M. Ogiwara, M. Mizuguchi et al., Appl. Phys. Lett., 103, 242409 (2013). 

[10] T. Kojima, M. Mizuguchi et al., J. Phys.: Conden. Matter, 26, 064207 (2014). 

[11] M. Kotsugi, M. Mizuguchi et al., J. Phys.: Conden. Matter, 26, 064206 (2014). 

[12] T. Kojima, M. Mizuguchi et al., J. Phys. D, 47, 425001 (2014). 

[13] T. Tashiro, M. Mizuguchi et al., J. Appl. Phys., 117, 17E309 (2015). 

[14] K. Mibu, M. Mizuguchi et al., J. Phys. D, 48, 205002 (2015). 

[15] T. Kojima, M. Mizuguchi et al., Thin Solid Films, 603, 348 (2016).


Biography:

Dr. Masaki Mizuguchi is an associate professor in Institute for Materials Research, Tohoku University in Japan. He graduated from the University of Tokyo, and obtained a Ph.D. degree in 2003. After being an assistant professor at Osaka University, he obtained the present position in 2009. His major research fields are magnetic thin films, nano-devices, and spintronics. He has published more than 100 original papers in journals, books and conference proceedings. 

More detailed information on his research career can be found in a web-site: 

http://db.tohoku.ac.jp/whois/e_detail/6a8de7280dd480d9173c93559bcd84ea.html

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