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

DNA sensor system developed for specific and sensitive measurement of cancer-relevant enzyme activity August 23rd, 2017

Lego proteins revealed: Self-assembling protein complexes based on a single mutation could provide scaffolding for nanostructures August 23rd, 2017

Heating quantum matter: A novel view on topology: Physicists demonstrate how heating up a quantum system can be used as a universal probe for exotic states of matter August 22nd, 2017

A Tougher Tooth: A new dental restoration composite developed by UCSB scientists proves more durable than the conventional material August 22nd, 2017

Chip Technology

Nagoya physicists resolve long-standing mystery of structure-less transition: Nagoya University-led team of physicists use a synchrotron radiation X-ray source to probe a so-called 'structure-less' transition and develop a new understanding of molecular conductors August 21st, 2017

Silk could improve sensitivity, flexibility of wearable body sensors August 20th, 2017

Freeze-dried foam soaks up carbon dioxide: Rice University scientists lead effort to make novel 3-D material August 16th, 2017

Two Scientists Receive Grants to Develop New Materials: Chad Mirkin and Monica Olvera de la Cruz recognized by Sherman Fairchild Foundation August 16th, 2017

Nanoelectronics

GLOBALFOUNDRIES Demonstrates 2.5D High-Bandwidth Memory Solution for Data Center, Networking, and Cloud Applications: Solution leverages 2.5D packaging with low-latency, high-bandwidth memory PHY built on FX-14™ ASIC design system August 9th, 2017

GLOBALFOUNDRIES, Silicon Mobility Deliver the Industry’s First Automotive FPCU to Boost Performance for Hybrid and Electric Vehicles: Silicon Mobility and GF’s 55nm LPx -enabled platform, with SST’s highly-reliable SuperFlash® memory technology, boosts automotive performance, ene August 3rd, 2017

Scientists discover new magnet with nearly massless charge carriers July 29th, 2017

Atomic discovery opens door to greener, faster, smaller electronic circuitry: Scientists find way to correct communication pathways in silicon chips, making them perfect July 27th, 2017

Discoveries

DNA sensor system developed for specific and sensitive measurement of cancer-relevant enzyme activity August 23rd, 2017

Lego proteins revealed: Self-assembling protein complexes based on a single mutation could provide scaffolding for nanostructures August 23rd, 2017

Heating quantum matter: A novel view on topology: Physicists demonstrate how heating up a quantum system can be used as a universal probe for exotic states of matter August 22nd, 2017

A Tougher Tooth: A new dental restoration composite developed by UCSB scientists proves more durable than the conventional material August 22nd, 2017

Announcements

DNA sensor system developed for specific and sensitive measurement of cancer-relevant enzyme activity August 23rd, 2017

Lego proteins revealed: Self-assembling protein complexes based on a single mutation could provide scaffolding for nanostructures August 23rd, 2017

Heating quantum matter: A novel view on topology: Physicists demonstrate how heating up a quantum system can be used as a universal probe for exotic states of matter August 22nd, 2017

A Tougher Tooth: A new dental restoration composite developed by UCSB scientists proves more durable than the conventional material August 22nd, 2017

Research partnerships

Lego proteins revealed: Self-assembling protein complexes based on a single mutation could provide scaffolding for nanostructures August 23rd, 2017

A Tougher Tooth: A new dental restoration composite developed by UCSB scientists proves more durable than the conventional material August 22nd, 2017

Researchers printed graphene-like materials with inkjet August 17th, 2017

Freeze-dried foam soaks up carbon dioxide: Rice University scientists lead effort to make novel 3-D material August 16th, 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