Journal
SENSORS AND ACTUATORS A-PHYSICAL
Volume 91, Issue 1-2, Pages 26-29Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/S0924-4247(01)00493-9
Keywords
colossal magnetoresistance; perovskite manganites; anisotropy; grain boundaries; angular and rotation-speed sensing
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We report on the fabrication of magnetic sensors based on bulk La0.67Sr0.33MnO3 and La0.67Ba0.33MnO3 material. The sensors were characterized at fields of 0-8 T and temperatures of 4.2-300 K. The sensors display a maximum sensitivity of similar to 200%/T at room temperature within a field range of 1-3 mT. For the sensor geometry investigated here, the low-field magnetoresistance (MR) of the sensors measured in three field orientations with respect to the sensor plane is strongly anisotropic. The high-field MR, in contrast, is found to be field-orientation independent. Periodic response of the sensor's resistance to the angle between the field and sensor-plane is demonstrated at room temperature. (C) 2001 Elsevier Science B.V. All rights reserved.
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