Temperature dependence of antiferromagnetic susceptibility in ferritin

Abstract

We show that antiferromagnetic susceptibility in ferritin increases with temperature between 4.2 K and 180 K (i. e. below the Néel temperature) when taken as the derivative of the magnetization at high fields ($30\times 10^4$ Oe). This behavior contrasts with the decrease in temperature previously found, where the susceptibility was determined at lower fields ($5\times 10^4$ Oe). At high fields (up to $50\times 10^4$ Oe) the temperature dependence of the antiferromagnetic susceptibility in ferritin nanoparticles approaches the normal behavior of bulk antiferromagnets and nanoparticles considering superantiferromagnetism, this latter leading to a better agreement at high field and low temperature. The contrast with the previous results is due to the insufficient field range used ($<5\times 10^4$ Oe), not enough to saturate the ferritin uncompensated moment.

7 pages, 7 figures, accepted in Phys. Rev. B

References in corpus (3)

• Relevance of a magnetic moment distribution and scaling law methods to study the magnetic behavior of antiferromagnetic nanoparticles
• Effects of spin non-collinearities in magnetic nanoparticles
• Evidence of random magnetic anisotropy in ferrihydrite nanoparticles based on analysis of statistical distributions

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