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Magnetic Properties of Diluted Magnetic Ln2S3:Eu3+ Semiconductor Nanoparticles

Author: LuSiYu
Tutor: ZhangMing
School: Jilin University
Course: Condensed Matter Physics
Keywords: In2S3Eu3+ Prepared Diluted magnetic semiconductors Nanoparticles Magnetism First Principles
CLC: TB383
Type: Master's thesis
Year: 2012
Downloads: 33
Quote: 1
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Abstract


Diluted magnetic semiconductors （DMSs） which a fraction of nonmagneticcations of the host semiconductors materials is randomly replaced by doped magneticions such as Fe2+,Eu3+,Ni2+and Mn2+,etc. Because of the doped magnetic ions, theDMS nanoparticles both have the magnetic properties and the semicondoutorproperties. Due to the novelty properties, DMSs have potential applications inmagnetic applications including spintronics, magnetic recording, and magneticswitching. So the One-dimensional, tow-dimensional, and three-dimensional DMSsget so many attentions from the scientists at home and abroad.In this article, Our own design and construction gas-liquid phase react on thefrosted glass hemisphere surface was invented to synthesize In2S3:Eu3+ DMSnanoparticles. We choose In2S3as Peculiar structure and the well-knownapplication-worthy properties, and choose Europium ions as dopants for the unusualoptical, magnetic, and photophysical phenomena of the semiconductors whichare doped with paramagnetic ions.Because of the weak ferromagnetism, the reports about the In2S3:Eu3+ DMSnanoparticles are rare so far. By this method we obtain more excellent ferromagneticproperties than the researches which reported in the before, especially better than themethod that gas-liquid phase react in the liquid. The samples were characterized bythe X-ray diffraction （XRD）, Transmission electron microscopy （TEM）, XPS, ICP andVSM. By experimental data studies, we found that Europium ions have beenincorporate into In2S3matrix. The In2S3nanoparticles have obvious ferromagnetic behavior.To understand the origin of the ferromagnetism in our experiment, Spinpolarization density of states （DOS） of the samples were calculated. The results showthat the phenomenon of ferromagnetism in2S3Eu3+nanocrystals arises from the Euatoms. The Europium atoms make the major contribution. The presence of Euimpurity atoms significantly reduces the formation energy of In vacancies, and causesthe formation of many vacancies. All these factors contributed to the ferromagnetismin our samples. The theoretical calculations show good agreement with theexperimental results.

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