TY - JOUR
T1 - Perpendicularly magnetized Ni/Pt (001) epitaxial superlattice
AU - Seki, T.
AU - Tsujikawa, M.
AU - Ito, K.
AU - Uchida, K.
AU - Kurebayashi, H.
AU - Shirai, M.
AU - Takanashi, K.
N1 - Funding Information:
We investigated the optimum film growth conditions to achieve the epitaxial growth of the perpendicularly magnetized Ni/Pt (001) superlattices directly on the (001) single-crystal substrate. We found that was the adequate growth temperature for (001)-oriented epitaxial growth as well as the formation of layered structure. This (001)-oriented epitaxial growth induced the PMA overcoming the shape anisotropy, resulting in the perpendicularly magnetized Ni/Pt. We obtained the high for . The Ni layer thickness dependence of structural parameters and magnetic properties clearly indicated that the strain effect largely contributes to the emergence of PMA. This experimental finding was supported by the first-principles calculation. The first-principles calculation also suggested the non-negligible contribution of interface magnetic anisotropy to the PMA, which was qualitatively consistent with the experimental results. The findings in this study will provide the useful knowledge for developing a perpendicularly magnetized superlattice. ACKNOWLEDGMENTS
Publisher Copyright:
© 2020 American Physical Society.
PY - 2020/6
Y1 - 2020/6
N2 - A perpendicularly magnetized ferromagnetic layer is an important building block for recent/future high-density spintronic memory applications. This paper reports the fabrication of perpendicularly magnetized Ni/Pt superlattices and the characterization of their structures and magnetic properties. The optimization of film growth conditions allowed us to grow epitaxial Ni/Pt (001) superlattices on SrTiO3 (001) single-crystal substrates. We investigated their structural parameters and magnetic properties as a function of the Ni layer thickness and obtained a high uniaxial magnetic anisotropy energy of 1.9×106erg/cm3 for a [Ni (4.0 nm)/Pt (1.0 nm)] superlattice. In order to elucidate the detailed mechanism on perpendicular magnetic anisotropy for the Ni/Pt (001) superlattices, the experimental results were compared with the first-principles calculations. It has been found that the strain effect is a prime source of the emergence of perpendicular magnetic anisotropy.
AB - A perpendicularly magnetized ferromagnetic layer is an important building block for recent/future high-density spintronic memory applications. This paper reports the fabrication of perpendicularly magnetized Ni/Pt superlattices and the characterization of their structures and magnetic properties. The optimization of film growth conditions allowed us to grow epitaxial Ni/Pt (001) superlattices on SrTiO3 (001) single-crystal substrates. We investigated their structural parameters and magnetic properties as a function of the Ni layer thickness and obtained a high uniaxial magnetic anisotropy energy of 1.9×106erg/cm3 for a [Ni (4.0 nm)/Pt (1.0 nm)] superlattice. In order to elucidate the detailed mechanism on perpendicular magnetic anisotropy for the Ni/Pt (001) superlattices, the experimental results were compared with the first-principles calculations. It has been found that the strain effect is a prime source of the emergence of perpendicular magnetic anisotropy.
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U2 - 10.1103/PhysRevMaterials.4.064413
DO - 10.1103/PhysRevMaterials.4.064413
M3 - Article
AN - SCOPUS:85088520882
VL - 4
JO - Physical Review Materials
JF - Physical Review Materials
SN - 2475-9953
IS - 6
M1 - 064413
ER -