TY - JOUR
T1 - Structural and magnetic properties of Ni 78 Fe 22 thin films sandwiched between low-softening-point glasses and application in spin devices
AU - Misawa, Takahiro
AU - Mori, Sumito
AU - Komine, Takashi
AU - Fujioka, Masaya
AU - Nishii, Junji
AU - Kaiju, Hideo
N1 - Funding Information:
This research was partially supported by Grant-in-Aid for Scientific Research (B) and Challenging Exploratory Research from the Japan Society for the Promotion of Science (JSPS) , the Precursory Research for Embryonic Science and Technology program from the Japan Science and Technology Agency (JST) , and the Cooperative Research Program of the Network Joint Research Center for Materials and Devices from the Ministry of Education, Culture, Sports, Science and Technology (MEXT) . The authors would like to express their sincere appreciation to Prof. Y. Matsuo, N. Kawai, H. Kasa, K. Nakamura, T. Ohta, and M. Takei of Hokkaido University and N. Yamashita of ISUZU GLASS CO., LTD. for their cooperation and helpful discussions.
Publisher Copyright:
© 2016 Elsevier B.V.
PY - 2016/12/30
Y1 - 2016/12/30
N2 - We investigate the structural and magnetic properties of Ni 78 Fe 22 thin films sandwiched between low-softening-point (LSP) glasses, which can be used in spin quantum cross (SQC) devices utilizing stray magnetic fields generated from magnetic thin-film edges. We also calculate the stray magnetic field generated between the two edges of Ni 78 Fe 22 thin-film electrodes in SQC devices and discuss the applicability to spin-filter devices. Using the established fabrication technique, we successfully demonstrate the formation of LSP-glass/Ni 78 Fe 22 /LSP-glass structures with smooth and clear interfaces. The coercivity of the Ni 78 Fe 22 thin films is enhanced from 0.9 to 103 Oe by increasing the applied pressure from 0 to 1.0 MPa in the thermal pressing process. According to the random anisotropy model, the enhancement of the coercivity is attributed to the increase in the crystal grain size. The stray magnetic field is also uniformly generated from the Ni 78 Fe 22 thin-film edge in the direction perpendicular to the cross section of the LSP-glass/Ni 78 Fe 22 /LSP-glass structures. Theoretical calculation reveals that a high stray field of approximately 5 kOe is generated when the distance between two edges of the Ni 78 Fe 22 thin-film electrodes is less than 5 nm and the thickness of Ni 78 Fe 22 is greater than 20 nm. These experimental and calculation results indicate that Ni 78 Fe 22 thin films sandwiched between LSP glasses are useful as electrodes for SQC devices, serving as spin-filter devices.
AB - We investigate the structural and magnetic properties of Ni 78 Fe 22 thin films sandwiched between low-softening-point (LSP) glasses, which can be used in spin quantum cross (SQC) devices utilizing stray magnetic fields generated from magnetic thin-film edges. We also calculate the stray magnetic field generated between the two edges of Ni 78 Fe 22 thin-film electrodes in SQC devices and discuss the applicability to spin-filter devices. Using the established fabrication technique, we successfully demonstrate the formation of LSP-glass/Ni 78 Fe 22 /LSP-glass structures with smooth and clear interfaces. The coercivity of the Ni 78 Fe 22 thin films is enhanced from 0.9 to 103 Oe by increasing the applied pressure from 0 to 1.0 MPa in the thermal pressing process. According to the random anisotropy model, the enhancement of the coercivity is attributed to the increase in the crystal grain size. The stray magnetic field is also uniformly generated from the Ni 78 Fe 22 thin-film edge in the direction perpendicular to the cross section of the LSP-glass/Ni 78 Fe 22 /LSP-glass structures. Theoretical calculation reveals that a high stray field of approximately 5 kOe is generated when the distance between two edges of the Ni 78 Fe 22 thin-film electrodes is less than 5 nm and the thickness of Ni 78 Fe 22 is greater than 20 nm. These experimental and calculation results indicate that Ni 78 Fe 22 thin films sandwiched between LSP glasses are useful as electrodes for SQC devices, serving as spin-filter devices.
KW - Coercivity
KW - Magnetic thin films
KW - Micromagnetic simulation
KW - Spin filter
KW - Thermal pressing
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U2 - 10.1016/j.apsusc.2016.08.100
DO - 10.1016/j.apsusc.2016.08.100
M3 - Article
AN - SCOPUS:84985990133
SN - 0169-4332
VL - 390
SP - 666
EP - 674
JO - Applied Surface Science
JF - Applied Surface Science
ER -