01794nas a2200253   4500008004100000022001400041245006300055210006300118260009500181300001400276490000600290520093200296653002201228653002101250653002401271653003001295100001601325700001501341700002401356700003001380700001601410700001701426856009701443       2008                        eng d  a1533-488000aStatic and dynamic magnetic properties of Co nanoparticles0 aStatic and dynamic magnetic properties of Co nanoparticles  a25650 NORTH LEWIS WAY, STEVENSON RANCH, CA 91381-1439 USAbAMER SCIENTIFIC PUBLISHERScAUG  a4086-40910 v83 a<p>Co nanoparticles have been synthesized using wet-chemical methods. As-synthesized particles show a sharp low temperature peak in zero-field cooled (ZFC) magnetization well below the blocking transition temperature and this feature is associated with surface spin disorder. We have investigated the dynamic magnetic properties of Co using ac susceptibility and resonant RF transverse susceptibility (TS). We also studied the memory and relaxation effects in these nanoparticle systems. From these measurements we show a typical blocking behavior of an assembly of superparamagnetic nanoparticles with a wide distribution of blocking temperatures. The transverse susceptibility measurements on these particles show the presence of anisotropy even above the blocking temperature. The role of surface anisotropy and the size distribution of the particles on the observed memory and magnetic relaxation effects are discussed.</p>10aAc Susceptibility10aCo Nanoparticles10aMagnetic relaxation10aTransverse Susceptibility1 aSrinath, S.1 aPoddar, P.1 aSidhaye, Deepti, S.1 aPrasad, Bhagavatula L. V.1 aGass, James1 aSrikanth, H.  uhttps://library.ncl.res.in/content/static-and-dynamic-magnetic-properties-co-nanoparticles-0