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Title: Enhanced magnetic properties in ZnCoAlO caused by exchange-coupling to Co nanoparticles

Abstract

Here, we report the results of a sequence of magnetisation and magneto-optical studies on laser ablated thin films of ZnCoAlO and ZnCoO that contain a small amount of metallic cobalt. The results are compared to those expected when all the magnetization is due to isolated metallic clusters of cobalt and with an oxide sample that is almost free from metallic inclusions. Using a variety of direct magnetic measurements and also magnetic circular dichroism we find that there is ferromagnetism within both the oxide and the metallic inclusions, and furthermore that these magnetic components are exchange-coupled when aluminium is included. This enhances both the coercive field and the remanence. Hence the presence of a controlled quantity of metallic nanoparticles in ZnAlO can improve the magnetic response of the oxide, thus giving great advantages for applications in spintronics.

Authors:
 [1];  [2];  [3];  [2];  [2];  [2];  [4];  [5];  [6];  [2];  [7];  [8];  [9];  [2];  [2]
  1. The Univ. of Sheffield (United Kingdom); Chinese Academy of Sciences, Beijing (People's Republic of China)
  2. The Univ. of Sheffield (United Kingdom)
  3. The Univ. of Sheffield (United Kingdom); Shanxi Normal Univ., Linfen (People's Republic of China)
  4. The Univ. of Sheffield (United Kingdom); Islamic Azad Univ. Arak Branch, Arak (Iran)
  5. The Univ. of Sheffield (United Kingdom); King Abdulaziz City for Science and Technology, Riyadh (Saudi Arabia)
  6. The Univ. of Sheffield (United Kingdom); King Saud Univ., Riyadh (Saudi Arabia)
  7. The Univ. of York, York (United Kingdom)
  8. Argonne National Lab. (ANL), Argonne, IL (United States)
  9. Shanxi Normal Univ., Linfen (People's Republic of China)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Scientific User Facilities Division
OSTI Identifier:
1427530
Grant/Contract Number:  
AC02-06CH11357
Resource Type:
Accepted Manuscript
Journal Name:
New Journal of Physics
Additional Journal Information:
Journal Volume: 18; Journal Issue: 11; Journal ID: ISSN 1367-2630
Publisher:
IOP Publishing
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ZnO; cobalt nanoparticles; MCD; magnetisation; coercive field; XAS

Citation Formats

Feng, Qi, Dizayee, Wala, Li, Xiaoli, Score, David S., Neal, James R., Behan, Anthony J., Mokhtari, Abbas, Alshammari, Marzook S., Al-Qahtani, Mohammed S., Blythe, Harry J., Chantrell, Roy W., Heald, Steve M., Xu, Xiao -Hong, Fox, A. Mark, and Gehring, Gillian A. Enhanced magnetic properties in ZnCoAlO caused by exchange-coupling to Co nanoparticles. United States: N. p., 2016. Web. doi:10.1088/1367-2630/18/11/113040.
Feng, Qi, Dizayee, Wala, Li, Xiaoli, Score, David S., Neal, James R., Behan, Anthony J., Mokhtari, Abbas, Alshammari, Marzook S., Al-Qahtani, Mohammed S., Blythe, Harry J., Chantrell, Roy W., Heald, Steve M., Xu, Xiao -Hong, Fox, A. Mark, & Gehring, Gillian A. Enhanced magnetic properties in ZnCoAlO caused by exchange-coupling to Co nanoparticles. United States. doi:10.1088/1367-2630/18/11/113040.
Feng, Qi, Dizayee, Wala, Li, Xiaoli, Score, David S., Neal, James R., Behan, Anthony J., Mokhtari, Abbas, Alshammari, Marzook S., Al-Qahtani, Mohammed S., Blythe, Harry J., Chantrell, Roy W., Heald, Steve M., Xu, Xiao -Hong, Fox, A. Mark, and Gehring, Gillian A. Wed . "Enhanced magnetic properties in ZnCoAlO caused by exchange-coupling to Co nanoparticles". United States. doi:10.1088/1367-2630/18/11/113040. https://www.osti.gov/servlets/purl/1427530.
@article{osti_1427530,
title = {Enhanced magnetic properties in ZnCoAlO caused by exchange-coupling to Co nanoparticles},
author = {Feng, Qi and Dizayee, Wala and Li, Xiaoli and Score, David S. and Neal, James R. and Behan, Anthony J. and Mokhtari, Abbas and Alshammari, Marzook S. and Al-Qahtani, Mohammed S. and Blythe, Harry J. and Chantrell, Roy W. and Heald, Steve M. and Xu, Xiao -Hong and Fox, A. Mark and Gehring, Gillian A.},
abstractNote = {Here, we report the results of a sequence of magnetisation and magneto-optical studies on laser ablated thin films of ZnCoAlO and ZnCoO that contain a small amount of metallic cobalt. The results are compared to those expected when all the magnetization is due to isolated metallic clusters of cobalt and with an oxide sample that is almost free from metallic inclusions. Using a variety of direct magnetic measurements and also magnetic circular dichroism we find that there is ferromagnetism within both the oxide and the metallic inclusions, and furthermore that these magnetic components are exchange-coupled when aluminium is included. This enhances both the coercive field and the remanence. Hence the presence of a controlled quantity of metallic nanoparticles in ZnAlO can improve the magnetic response of the oxide, thus giving great advantages for applications in spintronics.},
doi = {10.1088/1367-2630/18/11/113040},
journal = {New Journal of Physics},
number = 11,
volume = 18,
place = {United States},
year = {2016},
month = {11}
}

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