Virginia Tech. Department of Materials Science and EngineeringVirginia Tech. Department of Mechanical EngineeringVirginia Tech. Laboratory for Oxide Research and Education (L.O.R.E.)Korea Basic Science Institute. Division of Electron Microscopic ResearchNorth Carolina A&T State University. Department of Mechanical and Chemical EngineeringNorth Carolina A&T State University. Center for Advanced Materials and Smart StructuresOak Ridge National Laboratory. Condensed Matter Sciences DivisionUniversity of Alabama. Department of ChemistryUniversity of Alabama. Chemical Engineering and Center for Materials for Information Technology (MINT)Abiade, Jeremiah T.Oh, Sang HoKumar, DhananjayVarela, MariaPennycook, Stephen J.Guo, HaizhongGupta, ArunavaSankar, Jagannathan2015-05-212015-05-212008-10-01Abiade, Jeremiah T., Oh, Sang Ho, Kumar, Dhananjay, Varela, Maria, Pennycook, Stephen, Guo, Haizhong, Gupta, Arunava, Sankar, Jagannathan (2008). The effect of matrix and substrate on the coercivity and blocking temperature of self-assembled Ni nanoparticles. Journal of Applied Physics, 104(7). doi: 10.1063/1.29925280021-8979http://hdl.handle.net/10919/52406We have shown that the magnetic properties of nanoparticles may be tuned from superparamagnetic to ferromagnetic by changing the substrate or thin film matrix in which they are embedded. Nickel nanoparticles were embedded into alumina, titanium nitride, and cerium oxide matrices on both silicon and sapphire substrates via pulsed laser deposition. The laser ablation time on the nickel target was kept constant. Only nickel nanoparticles in cerium oxide showed characteristics of ferromagnetism (room temperature coercivity and remanence). Ni nanoparticles, in either alumina or titanium nitride, possessed blocking temperatures below 200 K. Detailed scanning transmission electron microscopy analysis has been conducted on the samples embedded into cerium oxide on both substrates and related to the magnetic data. (c) 2008 American Institute of Physics.7 pagesapplication/pdfen-USIn CopyrightNickelSapphireNanoparticlesCoercive forceThin film growthThe effect of matrix and substrate on the coercivity and blocking temperature of self-assembled Ni nanoparticlesArticle - Refereedhttp://scitation.aip.org/content/aip/journal/jap/104/7/10.1063/1.2992528Journal of Applied Physicshttps://doi.org/10.1063/1.2992528