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• W2099132413 abstract "SQUID magnetometry and electron magnetic resonance (EMR) spectroscopy at 9.28 GHz were employed to probe magnetism and surface spin disorder in Fe <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>3</sub> O <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>4</sub> nanoparticles. Transmission electron microscopy (TEM) and X-ray diffraction (XRD) analysis showed magnetite particles with size sime8 nm. Magnetization (M) versus temperature studies yielded blocking temperature T <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>B</sub> sime 170 K in H= 50 Oe. For T>T <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>B</sub> , M scales approximately as H/T with mu <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>p</sub> sime5400 mu <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>B</sub> as the magnetic moment/particle. At 5 K, the magnitudes of hysteresis loop parameters viz. coercivity H <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>c</sub> sime 37 Oe and saturation magnetization M <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>s</sub> = 62 emu/g are considerably smaller than the reported values for larger 150 nm Fe <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>3</sub> O <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>4</sub> particles. In EMR studies, a single symmetric line at gsime2.11 with linewidth DeltaH= 850Oe is observed at 300 K with the g-value and DeltaH increasing with decreasing T. These results are interpreted in terms of a disordered surface spin layer of 0.5 nm thickness" @default.
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• W2099132413 date "2007-06-01" @default.
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• W2099132413 title "Surface Spin Disorder in Fe$_{3}$O$_{4}$ Nanoparticles Probed by Electron Magnetic Resonance Spectroscopy and Magnetometry" @default.
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