Unraveling thickness-dependent spin relaxation in colossal magnetoresistance manganite films

Yu-Miin Sheu; S. A. Trugman; A. P. Chen; Q. X. Jia; A. J. Taylor; R. P. Prasankumar

doi:10.1063/1.5013258

Unraveling thickness-dependent spin relaxation in colossal magnetoresistance manganite films

Yu-Miin Sheu, S. A. Trugman, A. P. Chen, Q. X. Jia, A. J. Taylor, R. P. Prasankumar

研究成果: Article › 同行評審

3 引文斯高帕斯（Scopus）

摘要

We used ultrafast optical spectroscopy to study photoinduced spin relaxation in 10-100 nm thick La_0.7Ca_0.3MnO₃ films. The spin-lattice relaxation time displays a strong dependence on thickness below the Curie temperature. Our simulations show that the observed thickness-dependent relaxation results from much faster thermal decay through the substrate in thinner films that leads to artificially faster demagnetization. Furthermore, we provide an analytical approach to gain insight into the spin-lattice relaxation time for highly thermal dissipative films. Our study strongly suggests that careful consideration of the influence of transient thermal variations on photoinduced demagnetization is mandatory when incorporating absorbing thin magnetic films into heterostructures and devices.

原文	English
文章編號	012402
頁（從 - 到）	1-5
頁數	5
期刊	Applied Physics Letters
卷	113
發行號	1
DOIs	https://doi.org/10.1063/1.5013258
出版狀態	Published - 2 7月 2018

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abstract = "We used ultrafast optical spectroscopy to study photoinduced spin relaxation in 10-100 nm thick La0.7Ca0.3MnO3 films. The spin-lattice relaxation time displays a strong dependence on thickness below the Curie temperature. Our simulations show that the observed thickness-dependent relaxation results from much faster thermal decay through the substrate in thinner films that leads to artificially faster demagnetization. Furthermore, we provide an analytical approach to gain insight into the spin-lattice relaxation time for highly thermal dissipative films. Our study strongly suggests that careful consideration of the influence of transient thermal variations on photoinduced demagnetization is mandatory when incorporating absorbing thin magnetic films into heterostructures and devices.",

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AU - Sheu, Yu-Miin

AU - Trugman, S. A.

AU - Chen, A. P.

AU - Jia, Q. X.

AU - Taylor, A. J.

AU - Prasankumar, R. P.

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N2 - We used ultrafast optical spectroscopy to study photoinduced spin relaxation in 10-100 nm thick La0.7Ca0.3MnO3 films. The spin-lattice relaxation time displays a strong dependence on thickness below the Curie temperature. Our simulations show that the observed thickness-dependent relaxation results from much faster thermal decay through the substrate in thinner films that leads to artificially faster demagnetization. Furthermore, we provide an analytical approach to gain insight into the spin-lattice relaxation time for highly thermal dissipative films. Our study strongly suggests that careful consideration of the influence of transient thermal variations on photoinduced demagnetization is mandatory when incorporating absorbing thin magnetic films into heterostructures and devices.

AB - We used ultrafast optical spectroscopy to study photoinduced spin relaxation in 10-100 nm thick La0.7Ca0.3MnO3 films. The spin-lattice relaxation time displays a strong dependence on thickness below the Curie temperature. Our simulations show that the observed thickness-dependent relaxation results from much faster thermal decay through the substrate in thinner films that leads to artificially faster demagnetization. Furthermore, we provide an analytical approach to gain insight into the spin-lattice relaxation time for highly thermal dissipative films. Our study strongly suggests that careful consideration of the influence of transient thermal variations on photoinduced demagnetization is mandatory when incorporating absorbing thin magnetic films into heterostructures and devices.

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Unraveling thickness-dependent spin relaxation in colossal magnetoresistance manganite films

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