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Anisotropic low-field magnetoresistance of polycrystalline manganite sensors (1999)

Xu, Yunhui ; Dworak, V. ; Drechsler, A. ; [et al.]

Woodbury, NY : American Institute of Physics (AIP)

Applied Physics Letters 74 (1999), S. 2513-2515

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ISSN: 1077-3118

Source: AIP Digital Archive

Topics: Physics

Notes: Magnetic-field sensors of bulk La0.67Sr0.33MnO3 and La0.67Ba0.33MnO3 were fabricated. The investigations show that a large low-field magnetoresistance (MR) is exhibited by the polycrystalline samples. MR ratios of the sensors as large as 20% at 77 K and 1.5% at 298 K were observed in fields of 700 Oe. Corresponding field sensitivities as high as 170%/T at 3 mT and 298 K, and 700%–960%/T at 3–8 mT and 77 K were obtained. The low-field MR is associated with intergranular transport of spin-polarized electrons. It is found to be highly anisotropic. The phenomenon is discussed in terms of spin-polarized transport through two kinds of grain boundaries. These represent two extremes of grain-boundary environments. © 1999 American Institute of Physics.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.123024

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