Giant Magnetoresistance Effects in the Organic spin valve La0.67Sr0.33MnO3 /Polyaniline /Co with Polyaniline as Spacer

CHEN Haichao; LIU Zuli; ZHU Lei; MA Ming; YAO Kailun

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Giant Magnetoresistance Effects in the Organic spin valve La0.67Sr0.33MnO3 /Polyaniline /Co with Polyaniline as Spacer

CHEN Haichao #,LIU Zuli,ZHU Lei,MA Ming,YAO Kailun *

School of Physics, Huazhong University of Science and Technology, Wuhan 430074

*Correspondence author

#Submitted by

Subject:

Funding: Research Fund for the Doctoral Program of Higher Education （No.Nos. 20090142110064)）

Opened online:28 December 2012

Accepted by: none

Citation: CHEN Haichao,LIU Zuli,ZHU Lei.Giant Magnetoresistance Effects in the Organic spin valve La0.67Sr0.33MnO3 /Polyaniline /Co with Polyaniline as Spacer[OL]. [28 December 2012] http://en.paper.edu.cn/en_releasepaper/content/4506953

A vertical multilayer structured organic spin valve (OSV) La0.67Sr0.33MnO3 (LSMO)/Polyaniline (PANI)/Co has been prepared, wherein a novel π-conjugated organic semiconductor (OSEC)-PANI was used as spacer. The current-voltage (I-V) curves reveal that the I-V behaves nonlinearly at low bias (<3.3V) and linearly at high bias (>3.3V). The results show that the magnetic resistance(MR) is up to 54% at T=80K and current I=+0.1mA, and MR decreases non-monotonically with current and is non-symmetric with respect to the current polarity due to different spin injection mechanism of LSMO electrode and Co electrode. Moreover, it is found that the MR is a non-monotonic function of temperature at current I=IC, while it becomes monotonic at current I≠IC. The dramatic decrease of the MR is caused by the abrupt reduction of the surface spin polarization of LSMO electrode. The increase of the MR at I=IC at low temperature may be caused by the increasing of resistance of LSMO electrode, which overshadows the interface resistance of the device.

Keywords:Spin valve; Magnetoresistance; Organic spintronics; Multilayer film; Polyaniline

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