Radiation pressure excitation of a low temperature atomic force/magnetic force microscope for imaging in 4-300 K temperature range

Ümit Çelik, Özgür Karcı, Yiğit Uysallı, H. Özgür Özer, Ahmet Oral*

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4 Atıf (Scopus)

Özet

We describe a novel radiation pressure based cantilever excitation method for imaging in dynamic mode atomic force microscopy (AFM) for the first time. Piezo-excitation is the most common method for cantilever excitation, however it may cause spurious resonance peaks. Therefore, the direct excitation of the cantilever plays a crucial role in AFM imaging. A fiber optic interferometer with a 1310 nm laser was used both for the excitation of the cantilever at the resonance and the deflection measurement of the cantilever in a commercial low temperature atomic force microscope/magnetic force microscope (AFM/MFM) from NanoMagnetics Instruments. The laser power was modulated at the cantilever’s resonance frequency by a digital Phase Locked Loop (PLL). The laser beam is typically modulated by ∼500 μW, and ∼141.8 nmpp oscillation amplitude is obtained in moderate vacuum levels between 4 and 300 K. We have demonstrated the performance of the radiation pressure excitation in AFM/MFM by imaging atomic steps in graphite, magnetic domains in CoPt multilayers between 4 and 300 K and Abrikosov vortex lattice in BSCCO(2212) single crystal at 4 K for the first time.

Orijinal dilİngilizce
Makale numarası013705
DergiReview of Scientific Instruments
Hacim88
Basın numarası1
DOI'lar
Yayın durumuYayınlandı - 1 Oca 2017

Bibliyografik not

Publisher Copyright:
© 2017 Author(s).

Finansman

We would like to thank Dr. Olav Helvig from Western Digital, San Jose, California, United States for CoPt multilayers samples and Professor Kazuo Kadowaki, Tsukuba University, Japan for BSCCO samples. We acknowledge the partial financial support from Middle East Technical University with Project No. BAP-01-05-2016-007.

FinansörlerFinansör numarası
Western Digital, San Jose
Orta Doğu Teknik ÜniversitesiBAP-01-05-2016-007
University of Tsukuba

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