Magnetic properties of V atoms in ultra-thin epitaxial Gd/V bilayers

Piotr Pankowski 1Lech T. Baczewski 1A. Wawro 1K. Mergia 2S. Messoloras 2F. Ott 3

1. Polish Academy of Sciences, Institute of Physics, al. Lotników 32/46, Warszawa 02-668, Poland
2. Institute of Nuclear Technology & Radiation Protection, National Centre for Scientific Research Demokritos in Athens, Greece
3. Laboratory of Leon Brillouin CEA/Saclay, France

Abstract

The properties of artificial layered structures are in many cases revolutionary, revealing many phenomena that are not found previously in bulk materials. We present the study of magnetic properties of MBE grown epitaxial vanadium (V) / gadolinium (Gd) bilayers. The samples were grown in UHV conditions using standard MBE system. Configuration of the samples is the following: substrate Al2O3[11-20]/Mo 200 A buffer layer/V layer with thickness 4, 6, 8 or 10 monolayers (ML)/Gd layer 65 A. All samples were oxydation protected with Al cover layer. Quality of the subsequent layers and interfaces were investigated by RHEED during evaporation. To characterise structural properties and determine a detailed structure of the samples the X-ray reflectivity measurements were performed using synchrotron radiation. The magnetic properties of ultra thin gadolinium / vanadium bilayers were studied as a function of vanadium layer thickness (from 4 to 10 ML). To determine magnetic properties of the samples two methods were applied: VSM measurements for the hysteresis loops determination and Polarised Neutron Reflectivity (PNR) experiment was performed in order to evaluate separately the magnetic moments of V and Gd. The simulations of neutron reflectivity curves treated with Parratt algorithm clearly show a strong magnetic moment induced in V layers, which decreases with V layer thickness. We found approximately half of its bulk magnetic moment value for Gd atoms, this fact we connect to the roughness of Gd layers and its reduced dimensionality.

Acknowledgments: This work was partly supported by EU RTD project SPINOSA, contract no. IST-2001-33334.

Legal notice
  • Legal notice:

    Copyright (c) Pielaszek Research, all rights reserved.
    The above materials, including auxiliary resources, are subject to Publisher's copyright and the Author(s) intellectual rights. Without limiting Author(s) rights under respective Copyright Transfer Agreement, no part of the above documents may be reproduced without the express written permission of Pielaszek Research, the Publisher. Express permission from the Author(s) is required to use the above materials for academic purposes, such as lectures or scientific presentations.
    In every case, proper references including Author(s) name(s) and URL of this webpage: http://science24.com/paper/1054 must be provided.

 

Related papers
  1. Structural aspects of nanoscale magnetic patterning of epitaxial metallic thin films
  2. Catalytic growth by molecular beam epitaxy and properties of ZnTe-based semiconductor nanowires
  3. Magnetic anisotropy and structural properties of ferromagnet/MgO/ferromagnet system
  4. Structural and Magnetic Properties of Cr/Gd Multilayers Deposited on Sapphire and MgO Substrates
  5. Phase relationships in annealed Cu-Al-O layers
  6. Modification of magnetic properties of ultrathin cobalt layers by an overlayer structure

Presentation: poster at E-MRS Fall Meeting 2003, Symposium C, by Piotr Pankowski
See On-line Journal of E-MRS Fall Meeting 2003

Submitted: 2003-06-11 15:47
Revised:   2009-06-08 12:55
Google
 
Web science24.com
© 1998-2021 pielaszek research, all rights reserved Powered by the Conference Engine