Naslov
Study of the local magnetic fields fluctuations near surface of the nanomagnets Mn12-acetate by pulse EPR

Autori
Rakvin, Boris ; Žilić, Dijana ; North, J.Micah ; Dalal, Naresh S.

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
17th EENC/32nd AMPERE / - Lille, 2004

Skup
17th EENC/32nd AMPERE

Mjesto i datum
Lille, Francuska, 06.09.2004. - 11.09.2004

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
pulse EPR; Mn12-acetate

Sažetak
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. By employing Electron spin echo detected EPR, ED-EPR, it can be shown that beside dominant sharp signal, previously detected by CW-EPR, 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, T0, (1/T0~1/T2=delta). Thus, by measuring of T0 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.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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