Pulse EPR study of the local magnetic field fluctuations near surface of the nanomagnet Mn12-acetate (CROSBI ID 500525)
Prilog sa skupa u zborniku | sažetak izlaganja sa skupa | međunarodna recenzija
Podaci o odgovornosti
Rakvin, Boris ; Žilić, Dijana ; North J.Micah ; Dalal Naresh S.
engleski
Pulse EPR study of the local magnetic field fluctuations near surface of the nanomagnet Mn12-acetate
In the present study a pulse EPR spectroscopy and NMP-TCNQ paramagnetic probe has been employed for detecting local magnetic field fluctuation at the microsecond time scale in the vicinity of surface of single molecular magnets, SMM. Along easy axis of SMM one expects fluctuation of the local magnetic field within microsecond in the temperature region around 30K [1]. By employing Electron spin echo detected EPR, ED-EPR, it can be shown that beside dominant sharp signal, previously detected by CW-EPR [2, 3], one obtains an additional broad component of the NMP-TCNQ signal. The broad signal component represents an inhomogeneously broadened line. The homogeneous components of this line are narrower than the CW-EPR line and its linewidth, delta, can be approximated with the measured phase memory time, TM, (1/TM~1/T2=delta). Thus, by measuring of TM which originates from the broad inhomogeneus part of NMP-TCNQ spectrum, shifted due to local field, one expects to detect the effect of fluctuations of this field at the microsecond time scale. The present investigation has been undertaken for the lateral local magnetic field perpendicular to easy axis. This orientation is chosen in order to better understand process related for transverse local field which is directly involved in the important phenomenon of the magnetic quantum tunneling in Mn12-Ac [1]. REFERENCES: [1] D. Gatteschi and R. Sessoli, Angew. Chem. Int. 42, 268 (2003). [2] B. Rakvin, D. Žilić, J. M. North and N. S. Dalal, J. Mag. Res. 165, 260, (2003). [3] B. Rakvin, D. Žilić, N. S. Dalal, J. M. North, P. Cevc, D. Arčon and K. Zadro, Spectrochimica Acta Part A 60, 1241 (2004).
Pulse EPR; Mn12-acetate; NMP-TCNQ
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Podaci o prilogu
4-4-x.
2004.
objavljeno
Podaci o matičnoj publikaciji
SLONANO 2004-3rd Slovenian workshop on nanoscience and nanotechnology
Mihailovič, Dragan ; Arčon, Denis ; Dominko, Robert
Ljubljana:
Podaci o skupu
SLONANO 2004-3rd Slovenian workshop on nanoscience and nanotechnology
predavanje
21.10.2004-22.10.2004
Ljubljana, Slovenija