TITLE

Enhanced room-temperature magnetoresistance in La[sub 0.7]Sr[sub 0.3]MnO[sub 3]-glass composites

AUTHOR(S)
Gupta, S.; Ranjit, R.; Mitra, C.; Raychaudhuri, P.; Pinto, R.
PUB. DATE
January 2001
SOURCE
Applied Physics Letters;1/15/2001, Vol. 78 Issue 3, p362
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
In this letter, we report the improved magnetotransport properties of La[sub 0.7]Sr[sub 0.3]MnO[sub 3]-borosilicate glass composite with different weight percents of glass. All the composites showed ferromagnetic nature at room temperature. The microstructure of these composites was seen using a scanning electron microscope. The microstructure was reconfirmed using spot energy dispersive x-ray analysis. We observe an enhancement of the low-field magnetoresistance (<200 Oe) at room temperature for the optimal composition of 25 wt % of glass. It is argued that glass layer separating the grain boundaries may be acting as barrier for spin-polarized tunneling, thereby enhancing the low-field magnetoresistance. © 2001 American Institute of Physics.
ACCESSION #
4710731

 

Related Articles

  • Low-field magnetoresistance in the pyrochlore Tl2Mn2O7. Hwang, H. Y.; Cheong, S.-W. // Nature;10/30/1997, Vol. 389 Issue 6654, p942 

    Describes research which showed that low-field grain-boundary magnetoresistance can be realized in a non-perovskite magnetoresistive oxide, the pyrochlore Tl2Mn2O7. Magnetoresistance in perovskite manganites and its limitations; Modification of manganites by tunnelling; Benefits and explanation...

  • Critical change of magnetoresistance with bandwidth and doping in perovskite manganites. Tomioka, Y.; Kuwahara, H. // Applied Physics Letters;6/30/1997, Vol. 70 Issue 26, p3609 

    Investigates the magnetotransport properties of single-crystalline perovskite manganites. Exploration of optimized colossal magnetoresistance (MR); Enhancement of MR at a fixed nominal hole concentration; confirmation of the formation of single crystals by the back Laue reflection method.

  • Coexistence of intrinsic and extrinsic magnetoresistance in the double-perovskite Sr[sub 2]Fe(Mo[sub 1-x]W[sub x])O[sub 6-w] system. Lindén, J.; Yamamoto, T.; Nakamura, J.; Karppinen, M.; Yamauchi, H. // Applied Physics Letters;4/30/2001, Vol. 78 Issue 18, p2736 

    In a recent study, it was shown that by partially substituting Mo with W in the double-perovskite Sr[sub 2]FeMoO[sub 6-w] system, the magnetoresistivity can be enhanced. [K.-I. Kobayashi, T. Okuda, Y. Tomioka, T. Kimura, and Y. Tokura, J. Magn. Magn. Mater. 218, 17 (2000).] In order to explain...

  • Measurement of perpendicular giant magnetoresistance of Fe/Si superlattices. Endo, Yasushi; Kitakami, Osamu; Shimada, Yutaka // Applied Physics Letters;1/26/1998, Vol. 72 Issue 4, p495 

    The superlattices Fe/Si exhibit an antiferromagnetic coupling for very thin Si layers and giant magnetoresistance (GMR) is observed accompanying this coupling. The GMR for these superlattices measured with a current in the plane of the sample (CIP-GMR) is usually less than 0.2%. Considering a...

  • Using magnetoresistance to probe reversal asymmetry in exchange biased bilayers. Leighton, C.; Song, M. // Journal of Applied Physics;7/1/2000, Vol. 88 Issue 1, p344 

    Studies the anisotropic magnetoresistance of iron (Fe) films exchange coupled to antiferromagnetic MnF2 layers. Exchange bias and coercivity obtained from magnetoresistance; Asymmetry of the magnetoresistance in the magnetization reversal process.

  • Anisotropic magnetic domain structure of layered manganite La[sub 1.4]Sr[sub 1.6]Mn[sub 2]O[sub 7]. Fukumura, T.; Hasegawa, T.; Sugawara, H.; Tanaka, K.; Sakaki, H.; Kimura, T.; Tokura, Y. // Applied Physics Letters;4/2/2001, Vol. 78 Issue 14, p2023 

    The anisotropic magnetic domain structure of a layered manganite La[sub 1.4]Sr[sub 1.6]Mn[sub 2]O[sub 7] has been analyzed quantitatively. The evaluated dimensions of the domain indicate the low dimensionality and reproduce spontaneous formation of the bubble domain taking stability of the...

  • Heat Capacity of La[sub 1 – ][sub x]Sr[sub x]MnO[sub 3] Single Crystals in Different Magnetic States. Khlopkin, M. N.; Panova, G. Kh.; Shikov, A. A.; Sinyavskiı, V. F.; Shulyatev, D. A. // Physics of the Solid State;Jan2000, Vol. 42 Issue 1, p114 

    The heat capacity of three single-crystal samples of La[sub 1-x]Sr[sub x]MnO[sub 3] (x = 0, 0.2, and 0.3) is measured in the temperature range 4-400 K. It is found that the heat capacity undergoes abrupt changes due to the transitions from the antiferromagnetic phase to the paramagnetic phase (x...

  • Theoretical study of a hot-electron device with a base consisting of a magnetic multilayer. Yamauchi, Takashi; Mizushima, Koichi // Journal of Applied Physics;6/15/2002, Vol. 91 Issue 12, p9957 

    We studied the structure dependence of both the magnetoresistance (MR) ratio and the injection efficiency of a three-terminal device whose base consists of a magnetic multilayer. It was found that the injection efficiency of the device structure with a MR ratio over 200% does not exceed 0.08 at...

  • Giant magnetoimpedance and colossal magnetoresistance in La[sub 0.75]Sr[sub 0.25]MnO[sub 3] at room temperature. Qin, Hongwei; Hu, Jifan; Chen, Juan; Wang, Yizhong; Wang, Zhenxi // Journal of Applied Physics;6/15/2002, Vol. 91 Issue 12, p10003 

    The impedance as well as the resistance and reactance of the La[sub 0.75]Sr[sub 0.25]MnO[sub 3] manganite increase with increasing ac frequency due to the skin effect of the metal state below Curie temperature. The manganite La[sub 0.75]Sr[sub 0.25]MnO[sub 3] shows not only the colossal...

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics