Magnetic Properties of Lanthanide Chalcogenide Semiconducting Nanoparticles

Abstract

To understand the importance of the band gap to the magnetic ordering in magnetic semiconductors, we have studied the effect of particle size on the ferromagnetic Curie temperature in semiconducting EuS. We have synthesized capped approximately 20 nm EuS nanoparticles using a single-source precursor, [Eu(S(2)CN(i)()Bu(2))(3)Phen] decomposed in trioctylphosphine. The nanoparticles have been characterized by X-ray powder diffraction, TEM, and magnetic susceptibility measurements as a function of temperature and field. The Curie temperature, based on Arrott plots, is depressed by 1-2 K from the bulk value.

Element-specific magnetometry of EuS nanocrystals

“…1͒ showed the Curie temperature ͑T C ͒ to be 16.8 K through the use of Arrott plots a method which uses magnetic saturations extrapolated from magnetic isotherms to determine the transition temperature ͑see supporting information, figure S4 for details͒. 14,15 This is in good agreement with the reported bulk value of 16.7 K but contradicts previa͒ Author to whom correspondence should be addressed. Electronic mail: jin@chem.wisc.edu.…”

A Simple Reducing Approach Using Amine To Give Dual Functional EuSe Nanocrystals and Morphological Tuning

“…[19,20] The optical properties of the EuX NCs were rarely reported. Though it has been acknowledged that bulk EuX does not exhibit luminescence at room temperature, [21,22] while surfacemodified EuO and EuS exhibited characteristic luminescence under UV excitation.…”

Structural and Magnetic Studies of the Fe-Co-Zr-Mo-W-B Amorphous Alloy

“…5). The T C value obtained using this method reached 270 K. The character of the Arrott plots is typical for the second order phase transition in the amorphous sample [16]. Furthermore, the temperature changes of −∆S M were also determined from magnetization isotherms (Fig.…”

“…From thermomagnetic curves the Curie temperature of the Fe 58 Co 10 Zr 10 Mo 5 W 2 B 15 alloy was determined. Furthermore, the isothermal Arrott plots were constructed and the magnetic entropy changes were calculated [15,16].…”