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Magnetic Properties Of Iron Oxide Nanoclusters Within Microdomains Of Block Copolymers

Byeong-Hyeok Sohn, R. Cohen, G. Papaefthymiou
Published 1998 · Materials Science

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Abstract The magnetic properties of γ-Fe 2 O 3 nanoclusters grown within the microdomains of optically transparent block copolymer films were investigated. SQUID magnetometry and 57 Fe Mossbauer spectroscopy were employed with characteristic measurement times of 100 s and 10 −8 s, respectively. The observed magnetism of the ca. 5 nm diameter particles was dominated by quantum-size effects, collective magnetic excitations, and superparamagnetic relaxation processes associated with the sub-magnetic domain γ-Fe 2 O 3 nanoclusters. The combination of these two techniques allowed determination of the values of the magnetic anisotropy constant ( K = 1.58 × 10 5 J/m 3 ) and the pre-exponential factor ( τ 0 = 4.2 × 10 −12 s) which determine the magnetic behavior of the nanocomposites. At low temperatures, the nanocomposite films exhibited hysteresis with the saturated coercivity, H c 0 , equal to 530 Oe.
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