Enhancement of magnetoresistance using CoFe/Ru/CoFe synthetic ferrimagnetic pinned layer in BiFeO3 based spin-valves

Naganuma, Hiroshi; Bae, In Tae; Miyazaki, Takamichi; Kubota, Miho; Inami, Nobuhito; Kawada, Yuki; Oogane, Mikihiko; Mizukami, Shigemi; Han, Xiang; Ando, Yasuo

doi:10.1063/1.4745504

Cited by 4 publications

(1 citation statement)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…3,4) Therefore, the electric and magnetic properties of BFO films have been the subject of intense research in recent years. [5][6][7][8][9] On the other hand, few reports on their optical properties 10,11) or applications 12,13) have been published. It is important to know the exact optical properties of the BFO films for the development of various optical applications.…”

Section: Introductionmentioning

confidence: 99%

Thermooptic properties of epitaxial BiFeO₃films with different orientations

Shima

Tsutsumi

Suzuki

et al. 2018

Jpn. J. Appl. Phys.

Self Cite

View full text Add to dashboard Cite

We have fabricated epitaxial BiFeO 3 (BFO) films with various orientations on a SrTiO 3 substrate by chemical solution deposition, and evaluated their optical and thermooptic properties by spectroscopic ellipsometry. The refractive index of the epitaxial BFO films was estimated to range from 2.620 to 2.635 at a wavelength of 1550 nm at room temperature using six Gaussian oscillators, and a thermooptic coefficient ranging from %0.31 ' 10 %4 to %0.81 ' 10 %4 K %1 was obtained at a wavelength of 1550 nm. The refractive index increased with temperature. In addition, the rate of increase in refractive index changed at around the Neel temperature. It is suggested that this change is caused by the magnetovolume effect, because a similar change, the d-spacing change at around the Neel temperature, was also obseved. These results suggest that the BFO films have a high potential for application as an optical material with a high refractive index and that the effectual refractive index change can be controlled by the thermal expansion coefficient, even in the same material.

show abstract