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- W2005284814 abstract "Details of structural and magnetic properties of a sample of $ensuremath{beta}text{-Ni}{(text{OH})}_{2}$ with nanoplate morphology (sample A) are compared with those of the hydrothermally synthesized bulklike $ensuremath{beta}text{-Ni}{(text{OH})}_{2}$, sample B. Transmission electron microscopy, x-ray diffraction, infrared spectroscopy, and thermogravimetric analysis were used for structural characterization whereas studies of magnetic properties covered the temperature range of 2--350 K in magnetic fields upto $H=180text{ }text{kOe}$. Temperature dependence of the low-field susceptibilities, $ensuremath{chi}(text{ZFC})$ and $ensuremath{chi}(text{FC})$, showed that $ensuremath{chi}(text{ZFC})$ peak at ${T}_{text{P}}=24.5text{ }text{K}$ (26.5 K) for sample A (B) with $ensuremath{chi}(text{FC})>ensuremath{chi}(text{ZFC})$ below ${T}_{text{p}}$. Curie-Weiss fit of $ensuremath{chi}(text{ZFC})$ for $T>{T}_{text{P}}$ for sample A (B) yields $ensuremath{theta}=20.5text{ }text{K}$ (19.8 K) and magnetic moment $ensuremath{mu}=2.92text{ }{ensuremath{mu}}_{text{B}}$ $(3.30text{ }{ensuremath{mu}}_{text{B}})/{text{Ni}}^{2+}$. Measurements of the magnetization $M$ vs $H$ for $T<{T}_{text{P}}$ for sample A show a two-step transition to ferromagnetism with the first transition at ${H}_{text{C}1}ensuremath{simeq}28text{ }text{kOe}$ and the second transition at ${H}_{text{C}2}ensuremath{simeq}55text{ }text{kOe}$. For sample B, the transition at ${H}_{text{C}1}$ is absent and ${H}_{text{C}2}=53.5text{ }text{kOe}$. Using molecular-field approach and three exchange constants determined from the Curie-Weiss fits, theoretical expressions for ${H}_{text{C}1}$ and ${H}_{text{C}2}$ are derived from which estimates of ${H}_{text{C}1}$ and ${H}_{text{C}2}$ are found to be in good agreement with the experimental values. According to this model, bulk $ensuremath{beta}text{-Ni}{(text{OH})}_{2}$ orders antiferromagnetically (AF) at ${T}_{text{N}}ensuremath{simeq}25.5text{ }text{K}$, with the dominant intralayer ferromagnetic (FM) coupling and a weaker interlayer AF coupling resulting in metamagnetism and FM ordering for $Hensuremath{ge}{H}_{text{C}2}$. Nanosize effects are shown to lower ${T}_{text{P}}$ and ${T}_{text{N}}$ while also producing the transition at ${H}_{text{C}1}$ due to flipping of the surface layer ${text{Ni}}^{2+}$ spins." @default.
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- W2005284814 date "2010-11-02" @default.
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- W2005284814 title "Metamagnetism and nanosize effects in the magnetic properties of the quasi-two-dimensional system<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:mi>β</mml:mi><mml:mtext>-Ni</mml:mtext><mml:msub><mml:mrow><mml:mrow><mml:mo>(</mml:mo><mml:mrow><mml:mtext>OH</mml:mtext></mml:mrow><mml:mo>)</mml:mo></mml:mrow></mml:mrow><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>" @default.
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- W2005284814 doi "https://doi.org/10.1103/physrevb.82.184403" @default.
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