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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

Magnetoresistance of BFO/LSMO thin film under the illumination of light. Magnetoresistance curves R(H) of BFO/LSMO thin films at 25 K after −1 T FC under light illumination at (a)λ = 630 and (b)λ = 460 nm. For comparison, R(H) curves under dark conditions are superposed in both (a) and (b).
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Fig3: Magnetoresistance of BFO/LSMO thin film under the illumination of light. Magnetoresistance curves R(H) of BFO/LSMO thin films at 25 K after −1 T FC under light illumination at (a)λ = 630 and (b)λ = 460 nm. For comparison, R(H) curves under dark conditions are superposed in both (a) and (b).

Mentions: After confirming the validity of magnetoresistance for the investigation of exchange bias, we illuminated the entire BFO/LSMO thin film surface with light at 25 K. Figure 3a, b shows the R(H) curves for BFO/LSMO thin films on an STO substrate after −1 T FC with light illumination at λ = 630 and 460 nm, respectively. For comparison, we superposed the R(H) curves obtained without any illumination. The R(H) curves under dark conditions, as shown in Figure 3a, b, are slightly different because we measured R(H) just before illumination of each wavelength after FC from 300 to 25 K to remove training effects [6].Figure 3


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)

Magnetoresistance of BFO/LSMO thin film under the illumination of light. Magnetoresistance curves R(H) of BFO/LSMO thin films at 25 K after −1 T FC under light illumination at (a)λ = 630 and (b)λ = 460 nm. For comparison, R(H) curves under dark conditions are superposed in both (a) and (b).
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Fig3: Magnetoresistance of BFO/LSMO thin film under the illumination of light. Magnetoresistance curves R(H) of BFO/LSMO thin films at 25 K after −1 T FC under light illumination at (a)λ = 630 and (b)λ = 460 nm. For comparison, R(H) curves under dark conditions are superposed in both (a) and (b).
Mentions: After confirming the validity of magnetoresistance for the investigation of exchange bias, we illuminated the entire BFO/LSMO thin film surface with light at 25 K. Figure 3a, b shows the R(H) curves for BFO/LSMO thin films on an STO substrate after −1 T FC with light illumination at λ = 630 and 460 nm, respectively. For comparison, we superposed the R(H) curves obtained without any illumination. The R(H) curves under dark conditions, as shown in Figure 3a, b, are slightly different because we measured R(H) just before illumination of each wavelength after FC from 300 to 25 K to remove training effects [6].Figure 3

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