Verma, Shilpi and Verma, Apoorva and Srivastava, Avanish K. and Gupta, Anurag and Singh, Surinder P. and Singh, Priti (2016) Structural and magnetic properties of Mn-12-Stearate nanomagnets. Materials Chemistry and Physics, 177. pp. 140-146. ISSN 0254-0584

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Abstract

We present the synthesis and characterization of a fatty acid ligated Mniz, [Mn12O12(CH3(CH2)(16)CO2)(11)(CH3CO2)(5)(H2O)(4)], Mn-12-Stearate (2), a molecular nanomagnet of Mn-12 family that exhibits the enhanced solubility (in organic solvents) and aqueous stability. The chemical composition and morphology of Mn-12-Stearate have been established using FF-IR, UV-Vis, Raman and H-1 NMR spectroscopy, XRD, elemental analysis, TGA and electron microscopic techniques. The powder XRD and HR-TEM of compound 2 have revealed the formation of crystalline structure. The FC and ZFC magnetization (M) as a function of temperature (T) shows a blocking temperature T-B similar to 3.0 K. At T <= 3 K, the presence of hysteresis and periodic steps in the measured M-H loops indicate the presence of quantum tunnelling of magnetization (QTM). In the same T region, the observed decrease of magnetic relaxation rate with a decrease in T further implies the QTM to be thermally assisted. The estimated anisotropy energy barrier is found to be similar to 35 K.

Item Type:	Article
Additional Information:	Copyright for this article belongs to M/s Elsevier.
Uncontrolled Keywords:	Inorganic compounds Magnetic properties Magnetic materials Nanostructures
Subjects:	Materials Science
Divisions:	UNSPECIFIED
Depositing User:	Dr. Rajpal Walke
Date Deposited:	20 Apr 2018 07:07
Last Modified:	20 Apr 2018 07:07
URI:	http://npl.csircentral.net/id/eprint/2367

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