Giant magnetoresistance in La1-xSrxMnOz films near room temperature

H. L. Ju; C. Kwon; Qi Li; R. L. Greene; T. Venkatesan

doi:10.1063/1.112808

Giant magnetoresistance in La_1-xSr_xMnO_z films near room temperature

H. L. Ju, C. Kwon, Qi Li, R. L. Greene, T. Venkatesan

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Abstract

We report the observation of giant magnetoresistance near room temperature in ferromagnetic films of La_1-xSr_xMnO_z for 0.16≤x≤0.33. For B=5 T, the maximum magnetoresistance ratio [R(0)-R(B)]/R(0) of an annealed film is 60% at 260 K for x=0.2, and 35% at 330 K for x=0.33. Annealed films have higher Curie temperature (T_c), a larger saturation moment and a larger magnetoresistance effect near T _c than do as-grown films. The temperature dependence of resistivity for all the samples investigated is unusual, activated above T_c and metallic below T_c. This and the giant magnetoresistance are possibly explained by scattering from magnetic polarons which dominate the transport near T_c.

Original language	English (US)
Pages (from-to)	2108-2110
Number of pages	3
Journal	Applied Physics Letters
Volume	65
Issue number	16
DOIs	https://doi.org/10.1063/1.112808
State	Published - 1994

All Science Journal Classification (ASJC) codes

Physics and Astronomy (miscellaneous)

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10.1063/1.112808

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title = "Giant magnetoresistance in La1-xSrxMnOz films near room temperature",

abstract = "We report the observation of giant magnetoresistance near room temperature in ferromagnetic films of La1-xSrxMnOz for 0.16≤x≤0.33. For B=5 T, the maximum magnetoresistance ratio [R(0)-R(B)]/R(0) of an annealed film is 60% at 260 K for x=0.2, and 35% at 330 K for x=0.33. Annealed films have higher Curie temperature (Tc), a larger saturation moment and a larger magnetoresistance effect near T c than do as-grown films. The temperature dependence of resistivity for all the samples investigated is unusual, activated above Tc and metallic below Tc. This and the giant magnetoresistance are possibly explained by scattering from magnetic polarons which dominate the transport near Tc.",

author = "Ju, {H. L.} and C. Kwon and Qi Li and Greene, {R. L.} and T. Venkatesan",

year = "1994",

doi = "10.1063/1.112808",

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volume = "65",

pages = "2108--2110",

journal = "Applied Physics Letters",

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T1 - Giant magnetoresistance in La1-xSrxMnOz films near room temperature

AU - Ju, H. L.

AU - Kwon, C.

AU - Li, Qi

AU - Greene, R. L.

AU - Venkatesan, T.

PY - 1994

Y1 - 1994

N2 - We report the observation of giant magnetoresistance near room temperature in ferromagnetic films of La1-xSrxMnOz for 0.16≤x≤0.33. For B=5 T, the maximum magnetoresistance ratio [R(0)-R(B)]/R(0) of an annealed film is 60% at 260 K for x=0.2, and 35% at 330 K for x=0.33. Annealed films have higher Curie temperature (Tc), a larger saturation moment and a larger magnetoresistance effect near T c than do as-grown films. The temperature dependence of resistivity for all the samples investigated is unusual, activated above Tc and metallic below Tc. This and the giant magnetoresistance are possibly explained by scattering from magnetic polarons which dominate the transport near Tc.

AB - We report the observation of giant magnetoresistance near room temperature in ferromagnetic films of La1-xSrxMnOz for 0.16≤x≤0.33. For B=5 T, the maximum magnetoresistance ratio [R(0)-R(B)]/R(0) of an annealed film is 60% at 260 K for x=0.2, and 35% at 330 K for x=0.33. Annealed films have higher Curie temperature (Tc), a larger saturation moment and a larger magnetoresistance effect near T c than do as-grown films. The temperature dependence of resistivity for all the samples investigated is unusual, activated above Tc and metallic below Tc. This and the giant magnetoresistance are possibly explained by scattering from magnetic polarons which dominate the transport near Tc.

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Giant magnetoresistance in La_1-xSr_xMnO_z films near room temperature

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