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Article: Ground state tunneling and staircase hysteresis loop in molecular magnet Mn12 acetate

TitleGround state tunneling and staircase hysteresis loop in molecular magnet Mn12 acetate
Authors
KeywordsEnergy splitting
Single molecule magnets
Staircase hysteresis loop
Transverse anisotropy
Issue Date2006
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/jmmm
Citation
Journal Of Magnetism And Magnetic Materials, 2006, v. 299 n. 2, p. 376-382 How to Cite?
AbstractQuantum tunneling and staircase hysteresis loop of molecular magnet Mn 12 acetate are studied by means of the Landau-Zener method. It is focused on fitting the experimental hysteresis loop with five steps observed by Chiorescu et al. [Phys. Rev. Lett. 85 (2000) 4807] at a sweeping rate of applied field c=1.1×10-2T/s at temperature T<0.6K. Occurrence of five steps at ground-state tunneling region is an important criteria for determining the off-diagonal part of the Hamiltonian of Mn12. No more than four steps can be obtained if only fixed values of second-order and fourth-order transverse anisotropic terms are taken into account. We introduce the fluctuation of the parameter of second-order transverse anisotropic term. A Gaussian distribution of parameter is introduced and five steps in the hysteresis loop of Mn12 can be theoretically generated. The effects due to a rapid fluctuation field, which may be nuclear spins, is also analyzed under Landau-Zener model. © 2005 Elsevier B.V. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/80449
ISSN
2015 Impact Factor: 2.357
2015 SCImago Journal Rankings: 0.776
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorSu, YCen_HK
dc.contributor.authorShen, SQen_HK
dc.contributor.authorTao, RBen_HK
dc.date.accessioned2010-09-06T08:06:34Z-
dc.date.available2010-09-06T08:06:34Z-
dc.date.issued2006en_HK
dc.identifier.citationJournal Of Magnetism And Magnetic Materials, 2006, v. 299 n. 2, p. 376-382en_HK
dc.identifier.issn0304-8853en_HK
dc.identifier.urihttp://hdl.handle.net/10722/80449-
dc.description.abstractQuantum tunneling and staircase hysteresis loop of molecular magnet Mn 12 acetate are studied by means of the Landau-Zener method. It is focused on fitting the experimental hysteresis loop with five steps observed by Chiorescu et al. [Phys. Rev. Lett. 85 (2000) 4807] at a sweeping rate of applied field c=1.1×10-2T/s at temperature T<0.6K. Occurrence of five steps at ground-state tunneling region is an important criteria for determining the off-diagonal part of the Hamiltonian of Mn12. No more than four steps can be obtained if only fixed values of second-order and fourth-order transverse anisotropic terms are taken into account. We introduce the fluctuation of the parameter of second-order transverse anisotropic term. A Gaussian distribution of parameter is introduced and five steps in the hysteresis loop of Mn12 can be theoretically generated. The effects due to a rapid fluctuation field, which may be nuclear spins, is also analyzed under Landau-Zener model. © 2005 Elsevier B.V. All rights reserved.en_HK
dc.languageengen_HK
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/jmmmen_HK
dc.relation.ispartofJournal of Magnetism and Magnetic Materialsen_HK
dc.rightsJournal of Magnetism and Magnetic Materials. Copyright © Elsevier BV.en_HK
dc.subjectEnergy splittingen_HK
dc.subjectSingle molecule magnetsen_HK
dc.subjectStaircase hysteresis loopen_HK
dc.subjectTransverse anisotropyen_HK
dc.titleGround state tunneling and staircase hysteresis loop in molecular magnet Mn12 acetateen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0304-8853&volume=299&spage=376&epage=382&date=2006&atitle=Ground+state+tunneling+and+staircase+hysteresis+loop+in+molecular+magnet+Mn12+acetateen_HK
dc.identifier.emailShen, SQ: sshen@hkucc.hku.hken_HK
dc.identifier.authorityShen, SQ=rp00775en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.jmmm.2005.04.025en_HK
dc.identifier.scopuseid_2-s2.0-27844521792en_HK
dc.identifier.hkuros114206en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-27844521792&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume299en_HK
dc.identifier.issue2en_HK
dc.identifier.spage376en_HK
dc.identifier.epage382en_HK
dc.identifier.isiWOS:000234739900016-
dc.publisher.placeNetherlandsen_HK
dc.identifier.scopusauthoridSu, YC=7404456990en_HK
dc.identifier.scopusauthoridShen, SQ=7403431266en_HK
dc.identifier.scopusauthoridTao, RB=7102857052en_HK

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