Structural and magnetic properties of Mn-12-Stearate nanomagnets
IR@NPL: CSIR-National Physical Laboratory, New Delhi
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| Title |
Structural and magnetic properties of Mn-12-Stearate nanomagnets
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| Creator |
Verma, Shilpi
Verma, Apoorva Srivastava, Avanish K. Gupta, Anurag Singh, Surinder P. Singh, Priti |
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| Subject |
Materials Science
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| Description |
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.
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| Publisher |
Elsevier
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| Date |
2016-07-01
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| Type |
Article
PeerReviewed |
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| Format |
application/pdf
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| Identifier |
http://npl.csircentral.net/2367/1/Structural%20and.pdf
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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| Relation |
http://npl.csircentral.net/2367/
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