Negative coercivity characteristics in antiferromagnetic coupled hard/soft multilayers

Dong Young Kim, Cheol Gi Kim, Chong Oh Kim, Seok Soo Yoon, Mamiko Naka, Masakiyo Tsunoda, Migaku Takahashi

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13 Citations (Scopus)


We investigated the negative coercivity (Hc) by using the Stoner-Wohlfarth model in antiferromagnetic-coupled hard/soft bilayers. We found out the conditions for negative Hc in terms of thickness (dH) and anisotropy energy(KH) of hard layer such as dH<0.5 and dHKH>2J in antiferromagnetic-coupled bilayers. In order to test our predictions experimentally, we prepared a series of synthetic exchange-coupled multilayer structure of MnIr/CoFe/Ru(x)/CoFe/MnIr thin film with x = 0.9, 1.0 and 1.1 nm. The inverted hysteresis loop with negative Hc was observed in antiferromagnetic-coupled multilayers, and not in ferromagnetic-coupled sample. The negative Hc behavior was well agreed with the theoretical predictions.

Original languageEnglish
Pages (from-to)e356-e358
JournalJournal of Magnetism and Magnetic Materials
Issue number1
Publication statusPublished - 2006 Sept


  • Antiferromagnetic coupling
  • Hard/soft magnet
  • Negative coercivity


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