Nanotechnology Now

Our NanoNews Digest Sponsors

Heifer International

Wikipedia Affiliate Button

Home > Press > Mn-doped ZnS is unsuitable to act as a dilute magnetic semiconductor

This shows (a) Room temperature ESR spectra of ZnS:Mn; and (b) Low temperature ESR spectra of ZnS:Mn (20%).

Credit: ©Science China Press
This shows (a) Room temperature ESR spectra of ZnS:Mn; and (b) Low temperature ESR spectra of ZnS:Mn (20%).

Credit: ©Science China Press

Abstract:
Dilute magnetic semiconductors (DMS) have recently been a major focus of magnetic semiconductor research. A laboratory from the University of Science and Technology of China explored the feasibility of doping manganese (Mn) into zinc sulfide (ZnS) to obtain magnetic semiconductors.

Mn-doped ZnS is unsuitable to act as a dilute magnetic semiconductor

Hefei, PR China | Posted on February 20th, 2012

Hideo Ohno and his group at the Tohoku University, Japan, were the first to measure ferromagnetism in transition metal-doped semiconductors such as indium arsenide and gallium arsenide doped with Mn. Ever since, researchers have attempted to obtain semiconductor hosts doped with different transition metals that exhibit ferromagnetic properties.

A team of researchers from Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, discovered that Mn-doped ZnS (ZnS:Mn) shows paramagnetic behavior and is not suitable for use as a DMS. Their work entitled "Structure Characterization, Magnetic and Photoluminescence Properties of Mn-Doped ZnS Nanocrystalline" was published in SCIENCE CHINA Physics, Mechanics & Astronomy, 2012, Vol 55(2) .

Electron spin resonance (ESR) spectra (Figure 1a) of nanocrystalline ZnS:Mn show that at lower concentrations of Mn, a typical sextet centered at a g-value of 2 is associated with the allowed (Δms=±1, ΔmI=0) magnetic dipole transitions between the hyperfine-split Zeeman levels of the 6S5/2 ground state of the Mn2+ 3d electrons. The hyperfine structure arises from the interaction between the S=5/2 spin of the unpaired 3d electrons with I= 5/2 spin of the 55Mn nucleus. This indicates that Mn ions are distributed in the ZnS nanocrystalline lattice so that they are isolated from each other. At higher concentrations of Mn, the ions assemble together and are localized in the ZnS crystal lattice, decreasing the Mn-Mn atomic distance and increasing the dipole-dipole interaction. This causes the hyperfine structure to merge into one broad resonance. Further ESR experiments (Figure 1b) at low temperature also suggested that the sample was not ferromagnetic. All of the results indicated that ZnS:Mn is paramagnetic and not suitable for DMS.

See the article:

Zuo M, Tan S, Li G P, et al.Structure characterization,magnetic and photoluminescence properties of Mn doped ZnS nanocrystalline. SCIENCE CHINA Physics, Mechanics & Astronomy,2012,55: 219-223

####

For more information, please click here

Contacts:
Zhang Shuyuan

86-055-136-01503

Copyright © Science in China Press

If you have a comment, please Contact us.

Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.

Bookmark:
Delicious Digg Newsvine Google Yahoo Reddit Magnoliacom Furl Facebook

Related News Press

News and information

GLOBALFOUNDRIES Announces Availability of 45nm RF SOI to Advance 5G Mobile Communications: Optimized RF features deliver high-performance solutions for mmWave beam forming applications in 5G smartphones and base stations February 22nd, 2017

EmTech Asia breaks new barriers with potential applications of space exploration with NASA and MIT February 22nd, 2017

JPK selects compact tensile stage from Deben for their NanoWizard® AFM platform to broaden capabilities for materials characterisation February 22nd, 2017

Molecular phenomenon discovered by advanced NMR facility: Cutting edge technology has shown a molecule self-assembling into different forms when passing between solution state to solid state, and back again - a curious phenomenon in science - says research by the University of Wa February 22nd, 2017

Chip Technology

GLOBALFOUNDRIES Announces Availability of 45nm RF SOI to Advance 5G Mobile Communications: Optimized RF features deliver high-performance solutions for mmWave beam forming applications in 5G smartphones and base stations February 22nd, 2017

Strem Chemicals and Dotz Nano Ltd. Sign Distribution Agreement for Graphene Quantum Dots Collaboration February 21st, 2017

Particles from outer space are wreaking low-grade havoc on personal electronics February 19th, 2017

Liquid metal nano printing set to revolutionize electronics: Creating integrated circuits just atoms thick February 18th, 2017

Nanoelectronics

GLOBALFOUNDRIES Announces Availability of 45nm RF SOI to Advance 5G Mobile Communications: Optimized RF features deliver high-performance solutions for mmWave beam forming applications in 5G smartphones and base stations February 22nd, 2017

Particles from outer space are wreaking low-grade havoc on personal electronics February 19th, 2017

Liquid metal nano printing set to revolutionize electronics: Creating integrated circuits just atoms thick February 18th, 2017

1,000 times more efficient nano-LED opens door to faster microchips February 5th, 2017

Discoveries

Molecular phenomenon discovered by advanced NMR facility: Cutting edge technology has shown a molecule self-assembling into different forms when passing between solution state to solid state, and back again - a curious phenomenon in science - says research by the University of Wa February 22nd, 2017

Tiny nanoclusters could solve big problems for lithium-ion batteries February 21st, 2017

Oxford Instruments announces Dr Brad Ramshaw of Cornell University, as winner of the 2017 Lee Osheroff Richardson Science Prize February 20th, 2017

Breakthrough with a chain of gold atoms: In the field of nanoscience, an international team of physicists with participants from Konstanz has achieved a breakthrough in understanding heat transport February 20th, 2017

Announcements

GLOBALFOUNDRIES Announces Availability of 45nm RF SOI to Advance 5G Mobile Communications: Optimized RF features deliver high-performance solutions for mmWave beam forming applications in 5G smartphones and base stations February 22nd, 2017

EmTech Asia breaks new barriers with potential applications of space exploration with NASA and MIT February 22nd, 2017

JPK selects compact tensile stage from Deben for their NanoWizard® AFM platform to broaden capabilities for materials characterisation February 22nd, 2017

Molecular phenomenon discovered by advanced NMR facility: Cutting edge technology has shown a molecule self-assembling into different forms when passing between solution state to solid state, and back again - a curious phenomenon in science - says research by the University of Wa February 22nd, 2017

Research partnerships

Molecular phenomenon discovered by advanced NMR facility: Cutting edge technology has shown a molecule self-assembling into different forms when passing between solution state to solid state, and back again - a curious phenomenon in science - says research by the University of Wa February 22nd, 2017

Graphene foam gets big and tough: Rice University's nanotube-reinforced material can be shaped, is highly conductive February 13th, 2017

Cedars-Sinai, UCLA Scientists Use New ‘Blood Biopsies’ With Experimental Device to Speed Cancer Diagnosis and Predict Disease Spread: Leading-Edge Research Is Part of National Cancer Moonshot Initiative February 13th, 2017

Highly sensitive gas sensors for volatile organic compound detection February 6th, 2017

NanoNews-Digest
The latest news from around the world, FREE



  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoTech-Transfer
University Technology Transfer & Patents
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More











ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project