Naslov
An EPR method for probing surface magnetic fields, dipolar distances, and magnetization fluctuations in single molecule magnets

Autori
Rakvin, Boris ; Žilić, Dijana ; Dalal Naresh, S. ; North, J.Micah ; Cevc, Pavle ; Arčon, Denis ; Zadro, Krešo

Izvornik
Spectrochimica Acta Part A (1386-1425) 60 (2004); 1241-1245

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
EPR; Magnetic field strength; Single molecule magnet

Sažetak
We outline a spectroscopic method for probing the effective magnetic field B on the surface of crystals of the single molecule magnet (SMM) [(C6H15N3)6Fe8(3-O)2(2-OH)12]Br7(H2O)Br&middot ; ; H2O, (Fe8Br8). This technique utilizes the line shape changes in the EPR spectra of the organic radical 2, 2-diphenyl-1-picrylhydrazyl (DPPH) (g=2.0036, single peak) adsorbed onto the sample. The temperature dependence of the EPR line shifts scale with the sample's magnetization as measured by a SQUID magnetometer. Analysis of the line shape in terms of dipolar coupling between the DPPH and the SMM molecules on the surface, yields their average dipolar distance. The method's potential for measuring the magnetization fluctuation dynamics is briefly pointed out using the SMM [Mn12O12(CH3COO)16(H2O)4]&middot ; ; 2CH3COOH&middot ; ; 4H2O (Mn12-acetate).

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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