Ferromagnetic Behavior of Ultrathin Manganese Nanosheets

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• 作者：Sreemanta Mitra ; Amrita Mandal ; Anindya Datta ; Sourish Banerjee ; Dipankar Chakravorty
• 刊名：Journal of Physical Chemistry C
• 出版年：2011
• 出版时间：August 4, 2011
• 年：2011
• 卷：115
• 期：30
• 页码：14673-14677
• 全文大小：849K
• 年卷期：v.115,no.30(August 4, 2011)
• ISSN：1932-7455

文摘

Ferromagnetic behavior has been observed experimentally for the first time in nanostructured manganese. Ultrathin (0.6-nm) manganese nanosheets were synthesized inside the two-dimensional channels of sol鈥揼el-derived Na-4 mica. The magnetic properties of the confined system were measured within the 2鈥?00 K temperature range. The confined structure was found to show a ferromagnetic behavior with a nonzero coercivity value. The coercivity value remained nonzero throughout the entire temperature range of measurement. The experimental variation of the susceptibility as a function of temperature can be satisfactorily explained on the basis of a two-dimensional system with a Heisenberg Hamiltonian involving direct exchange interaction.