Superparamagnetic nanoparticles and clusters of a few Fe atoms in amorphous Fe<sub>0.33</sub>Zr<sub>0.67</sub> alloys
K Rhie; D G Naugle; B -H O; J T Markert; A H Morrish; X Z Zhou; K Rhie; Dept. of Phys., Texas A&M Univ., College Station, TX, USA; D G Naugle; Dept. of Phys., Texas A&M Univ., College Station, TX, USA; B -H O; Dept. of Phys., Texas A&M Univ., College Station, TX, USA; J T Markert; Dept. of Phys., Texas A&M Univ., College Station, TX, USA; A H Morrish; Dept. of Phys., Texas A&M Univ., College Station, TX, USA; X Z Zhou; Dept. of Phys., Texas A&M Univ., College Station, TX, USA
Журнал:
Journal of Physics: Condensed Matter
Дата:
1995-04-24
Аннотация:
A paramagnetic amorphous Fe<sub>0.33</sub>Zr<sub>0.67</sub> alloy has been studied with Mossbauer spectroscopy and SQUID magnetometry. Low-field magnetization measurements revealed the existence of superparamagnetic nanoparticles of thousands of mu <sub>B</sub> embedded in the alloy with a blocking temperature of 50 K. A saturation of local moments (15.9 mu <sub>B</sub>), possibly clusters of a few Fe ions, is observed at 4.6 K around 10 kOe. The temperature dependence of the high-field magnetic susceptibility of Fe<sub>0.33</sub>Zr<sub>0.67</sub> is interpreted with Curie's law for these Fe clusters and nanoparticles.
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