This article is cited in 4 papers

Solid-State Electronics

Coercivity of homogenized ensembles of anisotropic $\gamma$-Fe$_2$O$_3$ nanoparticles

A. B. Kulakov^a, I. P. Lavrent'ev^b, V. I. Petinov<sup>b

a</sup> Osipyan Institute of Solid State Physics, Russian Academy of Sciences, Chernogolovka, Moscow region
^b Institute of Problems of Chemical Physics, Russian Academy of Sciences, Chernogolovka, Moscow oblast, 142432, Russia

Abstract: The influence of interaction between anisotropic $\gamma$-Fe$_2$O$_3$ nanoparticles on their coercive force $H_c$ is studied. In samples where the degree of homogenization of anisotropic $\gamma$-Fe$_2$O$_3$ nanoparticles is high owing to mechanical, ultrasonic, and magnetic dispersion with subsequent filtering of resulting suspensions, $H_c$ is almost independent of volume concentration $\eta$ of the particles when $\eta$ varies between 4$\times$10$^{-4}$ and 10$^{-1}$. In samples homogenized only mechanically, the $H_c$ versus $\log\eta$ dependence is linear.

Received: 24.02.2009
Accepted: 18.05.2010

 English version: Technical Physics, 2011, 56:2, 238–244

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