4 years ago

Dramatic Drop of d0 Ferromagnetism with ZnO Nanocrystal Size in Vacuum and Air

Dramatic Drop of d0 Ferromagnetism with ZnO Nanocrystal Size in Vacuum and Air
Vitaly Proshchenko, Artem Pimachev, Yuri Dahnovsky
The dramatic drop of about 2.5 orders of magnitude in the Zn vacancy magnetization with nanocrystal (NC) size was experimentally found in ZnO quantum dots in vacuum and air. We explain such an unusual behavior by the different contributions of spatial surface and core Zn vacancy configurations. With the increase of a NC size, the core contribution to the total NC magnetization becomes more pronounced. Therefore, the magnetization drop with NC size can be explained by the input of the core configuration, which has the lowest magnetic moment, 260 times lower than the magnetic moments of other surface or core configurations. In air the additional oxygen molecules on a NC surface can cause chemical reactions of dissociation along with the attachments of the NC oxygen atoms. Such configurations are different from those of the vacuum ones, resulting in the different NC size-dependence of the magnetic moment. Excellent agreement between the experiments and computations is reached.

Publisher URL: http://dx.doi.org/10.1021/acs.jpcc.7b02990

DOI: 10.1021/acs.jpcc.7b02990

You might also like
Discover & Discuss Important Research

Keeping up-to-date with research can feel impossible, with papers being published faster than you'll ever be able to read them. That's where Researcher comes in: we're simplifying discovery and making important discussions happen. With over 19,000 sources, including peer-reviewed journals, preprints, blogs, universities, podcasts and Live events across 10 research areas, you'll never miss what's important to you. It's like social media, but better. Oh, and we should mention - it's free.

  • Download from Google Play
  • Download from App Store
  • Download from AppInChina

Researcher displays publicly available abstracts and doesn’t host any full article content. If the content is open access, we will direct clicks from the abstracts to the publisher website and display the PDF copy on our platform. Clicks to view the full text will be directed to the publisher website, where only users with subscriptions or access through their institution are able to view the full article.