Static magneto optical birefringence of new Electric Double Layered Magnetic Fluids

Magnetic birefringence measurements are performed under a static field on Electric Double Layered Magnetic Fluids based on copper and zinc ferrite nanostructures. The optical birefringence is related to a single-particle effect and well described by a Langevin model which includes a log- normal distribution of particles. By the field-induced birefringence level, these new magnetic fluids are comparable to usual ones, a result which could offer a new way for biological applications.

Authorship

J. Depeyrot

Universidade de Brasília, Instituto de Física , Complex Fluids Group, Brasília, Distrito Federal, BrazilUniversidade de BrasíliaBrazilBrasília, Distrito Federal, BrazilUniversidade de Brasília, Instituto de Física , Complex Fluids Group, Brasília, Distrito Federal, Brazil

G. J. da Silva

C. R. Alves

E. C. Sousa

M. Magalhães

Universidade de Brasília, Instituto de Química , Complex Fluids Group, São Paulo, SP, BrazilUniversidade de BrasíliaBrazilSão Paulo, SP, BrazilUniversidade de Brasília, Instituto de Química , Complex Fluids Group, São Paulo, SP, Brazil

A. M. Figueiredo Neto

M. H. Sousa

Universidade de Brasília, Instituto de Química , Complex Fluids Group, Brasília, Distrito Federal, BrazilUniversidade de BrasíliaBrazilBrasília, Distrito Federal, BrazilUniversidade de Brasília, Instituto de Química , Complex Fluids Group, Brasília, Distrito Federal, Brazil

F. A. Tourinho

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Figures | Tables

Figures (10)
Tables (3)

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Figure 1.
X-ray powder difratograms of copper and zinc ferrite nanoparticles. The characteristic diffracted directions [220], [311], [400], [422], [511], [440] and [533] of the spinel structure are indexed.

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Figure 2.
Normalized mass variation Dm/Dm_max or magnetic material yield as a function of the divalent metal molar ratio, X_M²⁺.

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Figure 3.
Log-log representation of the normalized magnetization M/F as a function of the applied magnetic field H. The full line is the best fit obtained by using the Langevin formalism coupled with a log-normal distribution (see Table 2 for the resulting parameters size distribution).

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Figure 4.
Component I_w at pulsation w of the transmitted light intensity as a function of the applied field for Zn-based sample. I_w is proportional to senj.

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Figure 5a.
Birefringence Dn and normalized birefringence Dn/F (inset) of copper ferrite samples as a function of the applied magnetic field. (

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Figure 5b.
Birefringence Dn and normalized birefringence Dn/F (inset) of zinc ferrite samples as a function of the applied magnetic field. (

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Figure 6a.
Log-log representation of the normalized birefringence Dn/F of Cu-based samples as a function of the applied magnetic field. The full line is the best fit obtained by using eq. (1) (see Table 2 for the resulting parameters size distribution).

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Figure 6b.
Log-log representation of the normalized birefringence Dn/F of Zn-based samples as a function of the applied magnetic field. The full line is the best fit obtained by using eq. (1) (see Table 2 for the resulting parameters size distribution).

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Figure 7a.
High field analysis of birefringence data for Cu-based samples. The inset illustrates the low field behavior Dn µ H².

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Figure 7b.
High field analysis of birefringence data for Zn-based samples. The inset illustrates the low field behavior Dn µ H².

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Table 1:
Crystallographic analysis of Fig. 1 for CuFe₂O₄ and ZnFe₂O₄ nanoparticles. The interplanar spacing d_hkl is calculated from the line position by using the Bragg law and the corresponding cubic lattice cell a is deduced. The experimental peak intensities I_exp are compared to the ASTM ones.

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Table 3:
Saturation magnetization and optical anisotropy of ferrite nanoparticles (chemically coprecipitated) with their relevant references.

Figure 1. X-ray powder difratograms of copper and zinc ferrite nanoparticles. The characteristic diffracted directions [220], [311], [400], [422], [511], [440] and [533] of the spinel structure are indexed.

Figure 2. Normalized mass variation Dm/Dm_max or magnetic material yield as a function of the divalent metal molar ratio, X_M²⁺.

Figure 3. Log-log representation of the normalized magnetization M/F as a function of the applied magnetic field H. The full line is the best fit obtained by using the Langevin formalism coupled with a log-normal distribution (see Table 2 for the resulting parameters size distribution).

Figure 4. Component I_w at pulsation w of the transmitted light intensity as a function of the applied field for Zn-based sample. I_w is proportional to senj.

Figure 5a. Birefringence Dn and normalized birefringence Dn/F (inset) of copper ferrite samples as a function of the applied magnetic field. (

Figure 5b. Birefringence Dn and normalized birefringence Dn/F (inset) of zinc ferrite samples as a function of the applied magnetic field. (

Figure 6a. Log-log representation of the normalized birefringence Dn/F of Cu-based samples as a function of the applied magnetic field. The full line is the best fit obtained by using eq. (1) (see Table 2 for the resulting parameters size distribution).

Figure 6b. Log-log representation of the normalized birefringence Dn/F of Zn-based samples as a function of the applied magnetic field. The full line is the best fit obtained by using eq. (1) (see Table 2 for the resulting parameters size distribution).

Figure 7a. High field analysis of birefringence data for Cu-based samples. The inset illustrates the low field behavior Dn µ H².

Figure 7b. High field analysis of birefringence data for Zn-based samples. The inset illustrates the low field behavior Dn µ H².

Table 1: Crystallographic analysis of Fig. 1 for CuFe₂O₄ and ZnFe₂O₄ nanoparticles. The interplanar spacing d_hkl is calculated from the line position by using the Bragg law and the corresponding cubic lattice cell a is deduced. The experimental peak intensities I_exp are compared to the ASTM ones.

Table 3: Saturation magnetization and optical anisotropy of ferrite nanoparticles (chemically coprecipitated) with their relevant references.

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Static magneto optical birefringence of new Electric Double Layered Magnetic Fluids

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