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Observation of Patterns by Magnetic Force Microcopy in Fe-alloys with Shape Memory Effect

Published online by Cambridge University Press:  21 March 2011

M. I.N. da Silva ,
J. C. González  and
M. S. Andrade
M. I.N. da Silva
Affiliation:
North Carolina State University, Analytical Instrumentation Facility, Raleigh, NC, 27695-7531, U.S.A.
J. C. González
Affiliation:
North Carolina State University, Analytical Instrumentation Facility, Raleigh, NC, 27695-7531, U.S.A.
M. S. Andrade
Affiliation:
Laboratório de Nanoscopia, Setor de Tecnologia Metalúrgica – CETEC, Av. José Cândido da Silveira, 2000, Belo Horizonte-MG, 31170-000, Brazil
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Abstract

In this study, we investigated the magnetic domains of a FeMnSiNiCr stainless steel sample using Magnetic Force Microscope (MFM). We compared the magnetic patterns obtained by scanning the sample with three coated probes with different magnetic properties: Medium magnetic moment (MM), low magnetic moment (LM), and low coercivity (LC). The probe-surface separation was varied between 25 to 300 nm in order to quantify the magnetic microstructure of the sample. A simple model for the probe-sample interaction was used to interpret the contrast change as a function of the probe-surface separation. The experiment showed that the average maximum frequency decreases with the probe-surface separation and the intensity of the frequency is the strongest for the MM probe. X ray diffraction experiments were used to identify the different phases present in the sample. The X-ray diffraction experiments together with the MFM showed that α-phase islands surrounded by a γ-phase matrix are responsible for the magnetic properties of the sample.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 674: Symposia T/U/V – Applications of Ferromagnetic and Optical Materials, Storage and Magnetoelectronics , 2001 , U7.4
Copyright
Copyright © Materials Research Society 2001

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References

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