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Journal Articles Journal of Solid State Chemistry Year : 2013

High temperature structural and magnetic properties of cobalt nanorods

Thomas Maurer
Frédéric Ott
Gregory Chaboussant

Abstract

We present in this paper the structural and magnetic properties of high aspect ratio Co nanoparticles (~10) at high temperatures (up to 623 K) using in-situ X ray diffraction (XRD) and SQUID characterizations. We show that the anisotropic shapes, the structural and texture properties are preserved up to 500 K. The coercivity can be modelled by µ0HC = 2(KMC + Kshape)/MS with KMC the magnetocrystalline anisotropy constant, Kshape the shape anisotropy constant and MS the saturation magnetization. HC decreases linearly when the temperature is increased due to the loss of the Co magnetocrystalline anisotropy contribution. At 500K, 50% of the room temperature coercivity is preserved corresponding to the shape anisotropy contribution only. We show that the coercivity drop is reversible in the range 300 - 500 K in good agreement with the absence of particle alteration. Above 525 K, the magnetic properties are irreversibly altered either by sintering or by oxidation.
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Dates and versions

hal-00916597 , version 1 (10-12-2013)

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Kahina Ait Atmane, Fatih Zighem, Yaghoub Soumare, Mona Ibrahim, Rym Boubekri, et al.. High temperature structural and magnetic properties of cobalt nanorods. Journal of Solid State Chemistry, 2013, 197, pp.297. ⟨10.1016/j.jssc.2012.08.009⟩. ⟨hal-00916597⟩
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