Effect of ion-irradiation-induced disorder on the low-field magnetoresistance of La0.67A0.33MnO3 (A=Sr, Ca)

S. M. Watts; M. Li; S. Wirth; K. H. Dahmen; S. Von Molnár; P. Xiong; A. S. Katz; R. C. Dynes

Effect of ion-irradiation-induced disorder on the low-field magnetoresistance of La_0.67A_0.33MnO₃ (A=Sr, Ca)

S. M. Watts, M. Li, S. Wirth, K. H. Dahmen, S. Von Molnár, P. Xiong, A. S. Katz, R. C. Dynes

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Abstract

We report on a systematic study of the correlation between the disorder produced by ion irradiation and the magnetoresistance (MR) behavior of two doped manganite films: a highly textured La_0.67Sr_0.33MnO₃ film on a (100) LaAlO₃ substrate and a film of La_0.67Ca_0.33MnO₃ on a YSZ substrate with a high degree of large-angle grain boundary disorder. The films were grown via metal organic chemical vapor deposition and exposed to irradiation of 200 keV Ne ions. The temperature and field dependence of the resistivity were measured on the same samples at different levels of damage. For the Sr-doped film, the bulk magnetic properties were observed to degrade faster with cumulative damage than transport. For both films at low temperature, a low-field hysteretic MR was either induced or enhanced by ion damage. These effects are discussed in terms of diffusive transport through "granular" magnetically disordered regions.

Original language	English
Pages (from-to)	4791-4793
Number of pages	3
Journal	Journal of Applied Physics
Volume	85
Issue number	8 II A
Publication status	Published - 15 Apr 1999
Externally published	Yes

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ASJC Scopus subject areas

Physics and Astronomy(all)
Physics and Astronomy (miscellaneous)

Cite this

Watts, S. M., Li, M., Wirth, S., Dahmen, K. H., Von Molnár, S., Xiong, P., Katz, A. S., & Dynes, R. C. (1999). Effect of ion-irradiation-induced disorder on the low-field magnetoresistance of La_0.67A_0.33MnO₃ (A=Sr, Ca). Journal of Applied Physics, 85(8 II A), 4791-4793.

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title = "Effect of ion-irradiation-induced disorder on the low-field magnetoresistance of La0.67A0.33MnO3 (A=Sr, Ca)",

abstract = "We report on a systematic study of the correlation between the disorder produced by ion irradiation and the magnetoresistance (MR) behavior of two doped manganite films: a highly textured La0.67Sr0.33MnO3 film on a (100) LaAlO3 substrate and a film of La0.67Ca0.33MnO3 on a YSZ substrate with a high degree of large-angle grain boundary disorder. The films were grown via metal organic chemical vapor deposition and exposed to irradiation of 200 keV Ne ions. The temperature and field dependence of the resistivity were measured on the same samples at different levels of damage. For the Sr-doped film, the bulk magnetic properties were observed to degrade faster with cumulative damage than transport. For both films at low temperature, a low-field hysteretic MR was either induced or enhanced by ion damage. These effects are discussed in terms of diffusive transport through {"}granular{"} magnetically disordered regions.",

author = "Watts, {S. M.} and M. Li and S. Wirth and Dahmen, {K. H.} and {Von Moln{\'a}r}, S. and P. Xiong and Katz, {A. S.} and Dynes, {R. C.}",

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T1 - Effect of ion-irradiation-induced disorder on the low-field magnetoresistance of La0.67A0.33MnO3 (A=Sr, Ca)

AU - Watts, S. M.

AU - Li, M.

AU - Wirth, S.

AU - Dahmen, K. H.

AU - Von Molnár, S.

AU - Xiong, P.

AU - Katz, A. S.

AU - Dynes, R. C.

PY - 1999/4/15

Y1 - 1999/4/15

N2 - We report on a systematic study of the correlation between the disorder produced by ion irradiation and the magnetoresistance (MR) behavior of two doped manganite films: a highly textured La0.67Sr0.33MnO3 film on a (100) LaAlO3 substrate and a film of La0.67Ca0.33MnO3 on a YSZ substrate with a high degree of large-angle grain boundary disorder. The films were grown via metal organic chemical vapor deposition and exposed to irradiation of 200 keV Ne ions. The temperature and field dependence of the resistivity were measured on the same samples at different levels of damage. For the Sr-doped film, the bulk magnetic properties were observed to degrade faster with cumulative damage than transport. For both films at low temperature, a low-field hysteretic MR was either induced or enhanced by ion damage. These effects are discussed in terms of diffusive transport through "granular" magnetically disordered regions.

AB - We report on a systematic study of the correlation between the disorder produced by ion irradiation and the magnetoresistance (MR) behavior of two doped manganite films: a highly textured La0.67Sr0.33MnO3 film on a (100) LaAlO3 substrate and a film of La0.67Ca0.33MnO3 on a YSZ substrate with a high degree of large-angle grain boundary disorder. The films were grown via metal organic chemical vapor deposition and exposed to irradiation of 200 keV Ne ions. The temperature and field dependence of the resistivity were measured on the same samples at different levels of damage. For the Sr-doped film, the bulk magnetic properties were observed to degrade faster with cumulative damage than transport. For both films at low temperature, a low-field hysteretic MR was either induced or enhanced by ion damage. These effects are discussed in terms of diffusive transport through "granular" magnetically disordered regions.

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