Magnetic Properties Of Diluted Magnetic Ln₂S₃:Eu³⁺ Semiconductor Nanoparticles

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.