Processing and analysis of lift height-dependent magnetic force microscopy images of bulk uniaxial crystals

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Resumo

The images of the magnetic domain structure stray fields were obtained on the basal plane of Nd2Fe14B and Y2(FexCo1–x)17 (x = 0.18, 0.41) bulk uniaxial crystal samples at different tip-sample lift heights (z) using the magnetic force microscope. The automated magnetic force microscopy images evaluation method was proposed. The average extremes number per unit length n values were calculated, n(z) dependences were plotted, the analytical expression for the approximation were derived. The n0 values, related to z = 0 point were obtained by experimental data approximation with the analytical expression. The values of average domain width D and domain wall energy surface density γ were calculated using the obtained n0 values.

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Sobre autores

A. Sinkevich

Tver State University

Autor responsável pela correspondência
Email: artem.sinkevich2602@gmail.com
Rússia, 170100 Tver

E. Semenova

Tver State University

Email: artem.sinkevich2602@gmail.com
Rússia, 170100 Tver

G. Dunaeva

Tver State University

Email: artem.sinkevich2602@gmail.com
Rússia, 170100 Tver

A. Karpenkov

Tver State University

Email: artem.sinkevich2602@gmail.com
Rússia, 170100 Tver

M. Lyakhova

Tver State University

Email: artem.sinkevich2602@gmail.com
Rússia, 170100 Tver

S. Smetannikova

Tver State University

Email: artem.sinkevich2602@gmail.com
Rússia, 170100 Tver

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2. Fig. 1. Images of the scattering fields of the DS with increasing elevation height z for samples of bulk uniaxial crystals of Nd2Fe14B (a), Y2(Fe0.18Co0.82)17 (b) and Y2(Fe0.41Co0.59)17 (c). The images were obtained on a magnetic force microscope using a two-pass technique in the phase mode.

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3. Fig. 2. Average number of extrema per unit length from the scanning height for samples Y2(Fe0.41Co0.59)17 (1), Y2(Fe0.18Co0.82)17 (2) and Nd2Fe14B (3).

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4. Fig. 3. Effect of noise on the MFM image of the Y2(Fe0.41Co0.59)17 sample and an example of the profile of the tenth scanning line smoothed using expression (6). Scan height z = 5 µm.

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5. Fig. 4. Example of the procedure for determining the noise coefficient for a Nd2Fe14B sample. Examples of MFM images with different lift heights z = 0.1, 0.9, 9.0 μm are considered. The initial dependence n(knoise), its first and second derivatives are presented.

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6. Fig. 5. The obtained n(z) dependencies approximated by expression (7) for the samples Nd2Fe14B (a), Y2(Fe0.18Co0.82)17 (b) and Y2(Fe0.41Co0.59)17 (c). The n(z) dependencies before noise processing are shown as black lines.

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7. Fig. 6. DS images of the compounds Nd2Fe14B (a), Y2(Fe0.41Co0.59)17 (b) and Y2(Fe0.18Co0.82)17 (c), obtained using the MOKE method.

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