Structure and Spin-Glass Properties of Cd0.5Mi0.5S Diluted Magnetic Semiconductor Quantum Dots

R. J. Bandaranayake; J. Y. Lin; H. X. Jiang; C. M. Sorensen

doi:10.1109/20.489763

Structure and Spin-Glass Properties of Cd_0.5Mi_0.5S Diluted Magnetic Semiconductor Quantum Dots

R. J. Bandaranayake, J. Y. Lin, H. X. Jiang, C. M. Sorensen

Electrical and Computer Engineering

Research output: Contribution to journal › Article › peer-review

4 Scopus citations

Abstract

Cd0.5Mn0.5S diluted magnetic semiconductor (DMS) quantum dots (QDs) of crystallite size ranging from 24 Å to the bulk have been chemically synthesized using an aqueous solution precipitation method and thermal annealing. Subsequent characterization indicates that the, “as prepared” material is of the cubic zinc blende structure which evolves with increasing size to the bulk hexagonal wurtzite structure. Magnetic properties of the DMS QDs have been measured with a SQUID magnetometer. A transition from a paramagnetic to a spin-glass (SG) state at a critical temperature Tf has been observed. Size dependence measurements on Tf indicate a minimum size for SG formation. Relaxation in isothermal remanent magnetization has also been measured and shows a power law decay.

Original language	English
Pages (from-to)	3761-3763
Number of pages	3
Journal	IEEE Transactions on Magnetics
Volume	31
Issue number	6
DOIs	https://doi.org/10.1109/20.489763
State	Published - Nov 1995

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title = "Structure and Spin-Glass Properties of Cd0.5Mi0.5S Diluted Magnetic Semiconductor Quantum Dots",

abstract = "Cd0.5Mn0.5S diluted magnetic semiconductor (DMS) quantum dots (QDs) of crystallite size ranging from 24 {\AA} to the bulk have been chemically synthesized using an aqueous solution precipitation method and thermal annealing. Subsequent characterization indicates that the, “as prepared” material is of the cubic zinc blende structure which evolves with increasing size to the bulk hexagonal wurtzite structure. Magnetic properties of the DMS QDs have been measured with a SQUID magnetometer. A transition from a paramagnetic to a spin-glass (SG) state at a critical temperature Tf has been observed. Size dependence measurements on Tf indicate a minimum size for SG formation. Relaxation in isothermal remanent magnetization has also been measured and shows a power law decay.",

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AU - Sorensen, C. M.

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N2 - Cd0.5Mn0.5S diluted magnetic semiconductor (DMS) quantum dots (QDs) of crystallite size ranging from 24 Å to the bulk have been chemically synthesized using an aqueous solution precipitation method and thermal annealing. Subsequent characterization indicates that the, “as prepared” material is of the cubic zinc blende structure which evolves with increasing size to the bulk hexagonal wurtzite structure. Magnetic properties of the DMS QDs have been measured with a SQUID magnetometer. A transition from a paramagnetic to a spin-glass (SG) state at a critical temperature Tf has been observed. Size dependence measurements on Tf indicate a minimum size for SG formation. Relaxation in isothermal remanent magnetization has also been measured and shows a power law decay.

AB - Cd0.5Mn0.5S diluted magnetic semiconductor (DMS) quantum dots (QDs) of crystallite size ranging from 24 Å to the bulk have been chemically synthesized using an aqueous solution precipitation method and thermal annealing. Subsequent characterization indicates that the, “as prepared” material is of the cubic zinc blende structure which evolves with increasing size to the bulk hexagonal wurtzite structure. Magnetic properties of the DMS QDs have been measured with a SQUID magnetometer. A transition from a paramagnetic to a spin-glass (SG) state at a critical temperature Tf has been observed. Size dependence measurements on Tf indicate a minimum size for SG formation. Relaxation in isothermal remanent magnetization has also been measured and shows a power law decay.

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