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- W2046134549 abstract "Core-shell exchange pinning has been found at the interface between surface crystallites of antiferromagnetic goethite $(ensuremath{alpha}text{ensuremath{-}}text{FeOOH})$ and ferrihydrite $({text{Fe}}_{5}{text{HO}}_{8}ifmmodecdotelsetextperiodcenteredfi{}{4mathrm{H}}_{2}mathrm{O})$ and $22phantom{rule{0.3em}{0ex}}text{nm}$ sized nanoparticles of a soft amorphous ferromagnet $({text{Fe}}_{69}{mathrm{B}}_{31})$. The pinning accounts for an unusually large coercivity and small saturation magnetization (${H}_{mathrm{c}}=165phantom{rule{0.3em}{0ex}}text{Oe}$, ${ensuremath{sigma}}_{mathrm{s}}=136phantom{rule{0.3em}{0ex}}text{emu}∕mathrm{g}$, at $10phantom{rule{0.3em}{0ex}}mathrm{K}$) in the nanoparticles, compared to melt-spun ribbons (${H}_{mathrm{c}}=60phantom{rule{0.3em}{0ex}}text{mOe}$, ${ensuremath{sigma}}_{mathrm{s}}=186phantom{rule{0.3em}{0ex}}text{emu}∕mathrm{g}$). It also explains field-cooled and zero-field-cooled thermomagnetization data in which peaks are observed in both curves at $150--200phantom{rule{0.3em}{0ex}}mathrm{K}$ in applied fields of $200--1000phantom{rule{0.3em}{0ex}}text{Oe}$; and the absence of an exchange bias effect, due to the lack of net coupling of the core and shell." @default.
- W2046134549 created "2016-06-24" @default.
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- W2046134549 date "2004-06-09" @default.
- W2046134549 modified "2023-10-01" @default.
- W2046134549 title "Interfacial exchange pinning in amorphous iron-boron nanoparticles" @default.
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- W2046134549 doi "https://doi.org/10.1103/physrevb.69.212401" @default.
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