Limits...
Intriguing photo-control of exchange bias in BiFeO3/La2/3Sr1/3MnO3 thin films on SrTiO3 substrates.

Sung KD, Lee TK, Jung JH - Nanoscale Res Lett (2015)

Bottom Line: Through an ex situ pulsed laser deposition technique, we successfully synthesized epitaxial BiFeO3/La2/3Sr1/3MnO3 thin films on SrTiO3 substrates.After illumination of red and blue lights, the exchange bias was sharply reduced compared to that measured in the dark.It is possible to reasonably explain these behaviors by considering photo-injection from SrTiO3 and the photo-conductivity of La2/3Sr1/3MnO3.

View Article: PubMed Central - PubMed

Affiliation: Department of Physics, Inha University, Incheon, 402-751 Republic of Korea.

ABSTRACT
To date, electric fields have been widely used to control the magnetic properties of BiFeO3-based antiferromagnet/ferromagnet heterostructures through application of an exchange bias. To extend the applicability of exchange bias, however, an alternative mechanism to electric fields is required. Here, we report the photo-control of exchange bias in BiFeO3/La2/3Sr1/3MnO3 thin films on an SrTiO3 substrate. Through an ex situ pulsed laser deposition technique, we successfully synthesized epitaxial BiFeO3/La2/3Sr1/3MnO3 thin films on SrTiO3 substrates. By measuring magnetoresistance under light illumination, we investigated the effect of light illumination on resistance, exchange bias, and coercive field in BiFeO3/La2/3Sr1/3MnO3 thin films. After illumination of red and blue lights, the exchange bias was sharply reduced compared to that measured in the dark. With increasing light intensity, the exchange bias under red and blue lights initially decreased to zero and then appeared again. It is possible to reasonably explain these behaviors by considering photo-injection from SrTiO3 and the photo-conductivity of La2/3Sr1/3MnO3. This study may provide a fundamental understanding of the mechanism underlying photo-controlled exchange bias, which is significant for the development of new functional spintronic devices.

No MeSH data available.


Related in: MedlinePlus

Intensity and wavelength dependent resistance, exchange bias, and coercive field of BFO/LSMO thin film. Light intensity dependence of (a) resistance R(HX), (b) exchange bias field HE, and (c) coercive field HC for λ = 630 nm (red spheres) and 460 nm (blue spheres). In (a), (b), and (c), corresponding values under dark conditions (black spheres) are superposed for comparison.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC4385218&req=5

Fig4: Intensity and wavelength dependent resistance, exchange bias, and coercive field of BFO/LSMO thin film. Light intensity dependence of (a) resistance R(HX), (b) exchange bias field HE, and (c) coercive field HC for λ = 630 nm (red spheres) and 460 nm (blue spheres). In (a), (b), and (c), corresponding values under dark conditions (black spheres) are superposed for comparison.

Mentions: To further investigate exchange bias, R(H) was measured under different light intensities. Figure 4a, b, c shows light intensity-dependent resistance R(HX), exchange bias field HE, and coercive field HC, respectively, for wavelengths of λ = 630 nm (red spheres) and 460 nm (blue spheres). For comparison, R(HX), HE, and HC without illumination are superposed (black spheres). As the intensity of light increases, the resistance slightly decreased under red light, while increasing for blue light (Figure 4a). Exchange bias decreased down to almost zero and then became nearly constant for red light and slightly increased for blue light (Figure 4b). In contrast, the coercive field for both red and blue light decreased.Figure 4


Intriguing photo-control of exchange bias in BiFeO3/La2/3Sr1/3MnO3 thin films on SrTiO3 substrates.

Sung KD, Lee TK, Jung JH - Nanoscale Res Lett (2015)

Intensity and wavelength dependent resistance, exchange bias, and coercive field of BFO/LSMO thin film. Light intensity dependence of (a) resistance R(HX), (b) exchange bias field HE, and (c) coercive field HC for λ = 630 nm (red spheres) and 460 nm (blue spheres). In (a), (b), and (c), corresponding values under dark conditions (black spheres) are superposed for comparison.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4385218&req=5

Fig4: Intensity and wavelength dependent resistance, exchange bias, and coercive field of BFO/LSMO thin film. Light intensity dependence of (a) resistance R(HX), (b) exchange bias field HE, and (c) coercive field HC for λ = 630 nm (red spheres) and 460 nm (blue spheres). In (a), (b), and (c), corresponding values under dark conditions (black spheres) are superposed for comparison.
Mentions: To further investigate exchange bias, R(H) was measured under different light intensities. Figure 4a, b, c shows light intensity-dependent resistance R(HX), exchange bias field HE, and coercive field HC, respectively, for wavelengths of λ = 630 nm (red spheres) and 460 nm (blue spheres). For comparison, R(HX), HE, and HC without illumination are superposed (black spheres). As the intensity of light increases, the resistance slightly decreased under red light, while increasing for blue light (Figure 4a). Exchange bias decreased down to almost zero and then became nearly constant for red light and slightly increased for blue light (Figure 4b). In contrast, the coercive field for both red and blue light decreased.Figure 4

Bottom Line: Through an ex situ pulsed laser deposition technique, we successfully synthesized epitaxial BiFeO3/La2/3Sr1/3MnO3 thin films on SrTiO3 substrates.After illumination of red and blue lights, the exchange bias was sharply reduced compared to that measured in the dark.It is possible to reasonably explain these behaviors by considering photo-injection from SrTiO3 and the photo-conductivity of La2/3Sr1/3MnO3.

View Article: PubMed Central - PubMed

Affiliation: Department of Physics, Inha University, Incheon, 402-751 Republic of Korea.

ABSTRACT
To date, electric fields have been widely used to control the magnetic properties of BiFeO3-based antiferromagnet/ferromagnet heterostructures through application of an exchange bias. To extend the applicability of exchange bias, however, an alternative mechanism to electric fields is required. Here, we report the photo-control of exchange bias in BiFeO3/La2/3Sr1/3MnO3 thin films on an SrTiO3 substrate. Through an ex situ pulsed laser deposition technique, we successfully synthesized epitaxial BiFeO3/La2/3Sr1/3MnO3 thin films on SrTiO3 substrates. By measuring magnetoresistance under light illumination, we investigated the effect of light illumination on resistance, exchange bias, and coercive field in BiFeO3/La2/3Sr1/3MnO3 thin films. After illumination of red and blue lights, the exchange bias was sharply reduced compared to that measured in the dark. With increasing light intensity, the exchange bias under red and blue lights initially decreased to zero and then appeared again. It is possible to reasonably explain these behaviors by considering photo-injection from SrTiO3 and the photo-conductivity of La2/3Sr1/3MnO3. This study may provide a fundamental understanding of the mechanism underlying photo-controlled exchange bias, which is significant for the development of new functional spintronic devices.

No MeSH data available.


Related in: MedlinePlus