Title:
Exchange-coupled FePt nanoparticle assembly
Exchange-coupled FePt nanoparticle assembly
Author(s)
Zeng, Hao
Sun, Shouheng
Vedantam, T. S.
Dai, Z. R.
Liu, J. Ping
Wang, Z. L. (Zhong Lin)
Sun, Shouheng
Vedantam, T. S.
Dai, Z. R.
Liu, J. Ping
Wang, Z. L. (Zhong Lin)
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Abstract
We have produced exchange-coupled FePt nanoparticle assemblies by chemical synthesis and subsequent thermal annealing. As the interparticle distances decrease by tuning the annealing conditions, interparticle interactions change from dipolar type to exchange type, and the magnetization reversal mechanism switches from rotation controlled to domain-nucleation controlled. With increasing annealing temperature, the coercivity first increases due to improved chemical ordering, and then drops significantly, resulting from excessive interparticle exchange coupling. For the samples exhibiting exchange coupling, both the remanence ratio and coercive squareness increase.
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Date Issued
2002-04-08
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Article