Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1684574 | Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms | 2006 | 4 Pages |
Abstract
Magnetic Ni nano-particles in the near surface regions of MgO single crystals have been synthesized by 64Â keV Ni ion implantation to 1Â ÃÂ 1017Â cmâ2 followed by thermal annealing. Transmission electron microscopy (TEM) and magnetic properties measurement system (MPMS) equipped with a superconducting quantum interference device (SQUID) detector have been employed to characterize the microstructure and magnetic properties of the Ni nano-particles. The average particle size ranges 3-5Â nm in the as-implanted sample and 8-10Â nm in the annealed sample. The orientation of Ni particles is perfectly matched with that of the MgO matrix. The M-H hysteresis loop measured at 10Â K revealed the coercivity, Hc, â¼195Â Oe. The superparamagnetism of Ni particles was evident in as-implanted sample at the temperature above 35Â K but did not show in the annealed sample.
Related Topics
Physical Sciences and Engineering
Materials Science
Surfaces, Coatings and Films
Authors
S. Zhu, X. Xiang, X.T. Zu, L.M. Wang,