Coercivity and Exchange Bias of Mn0.25Ti1.1S2 in the Cluster-Glass StatePhysical Review B (2010)
Magnetic measurements have been carried out on the Mn-intercalated transition-metal dichalcogenide Mn0.25Ti1+yS2. The material, which contained a concentration y≈0.1 of excess intercalated Ti, exhibited paramagnetic behavior at high temperatures with an effective moment per Mn ion of μeff=6.07±0.23μB, which shows that the system comprises localized Mn2+ moments. A Curie-Weiss temperature ΘCW=−26±1K indicated that antiferromagnetic interactions were dominant. Deviation from Curie-Weiss behavior below 100 K signaled the formation of antiferromagnetically correlated clusters. Bifurcation of the zero-field-cooled and field-cooled magnetizations below 20 K indicated a transition to a cluster-glass state. The cluster-glass state exhibited hysteresis and a loop shift indicating exchange bias. The behavior of the coercivity and exchange bias can be understood using a model in which frozen spins at the periphery of a cluster interact with the antiferromagnetically correlated interior.
Publication DateDecember 10, 2010
Citation InformationPaul M. Shand, T. Rash, M. Streicher, Tim Kidd, et al.. "Coercivity and Exchange Bias of Mn0.25Ti1.1S2 in the Cluster-Glass State" Physical Review B Vol. 82 Iss. 21 (2010)
Available at: http://works.bepress.com/tim-kidd/20/