Presence of mixed magnetic phase in mechanically milled nanosized Co0.5Zn0.5Fe2O4: A study on structural, magnetic and hyperfine properties

K. Sarkar; R. Mondal; S. Dey; S. Majumder; S. Kumar

doi:10.1016/j.jmmm.2019.165303

Presence of mixed magnetic phase in mechanically milled nanosized Co_0.5Zn_0.5Fe₂O₄: A study on structural, magnetic and hyperfine properties

K. Sarkar, R. Mondal, S. Dey, S. Majumder, S. Kumar

Research output: Contribution to journal › Article › peer-review

10 Scopus citations

Abstract

In this paper, we have presented a detailed study on the effects of mechanical activation caused by high energy ball milling on the structural, magnetic and hyperfine properties of nanosized Co_0.5Zn_0.5Fe₂O₄ having three different particle sizes 63 (M1), 25 (M2) and 17 nm (M3) synthesized by chemical coprecipitation method. Characterization techniques like powder x-ray diffraction, high resolution transmission electron microscopy, dc magnetic measurements and Mössbauer spectroscopic techniques have been employed to examine M1, M2 and M3 thoroughly. All the three samples are cubic spinel ferrites with Fd3-m symmetry. The lattice parameters of M1, M2 and M3 are 8.395, 8.391 and 8.375 Å, respectively. The particles constituting all the three samples possess both superparamagnetic and ferrimagnetic phases at room temperature. The values of blocking temperature of M1, M2 and M3 are 204, 210 and 220 K, respectively. The values of saturation magnetization of M1, M2 and M3 at 300 and 10 K are 56.8, 55.3, 51.5 emu g⁻¹ and 115.68, 113.84, 109.65 emu g⁻¹, respectively. The values of coercivity for M1, M2 and M3 at 10 K are 1395, 2190 and 1950 Oe, respectively. The theory of magnetic domains has been exploited to explicate the trend in coercivity. The cation distribution of M2 is (Zn²⁺ _0.48Fe³⁺ _0.52)_A[Co²⁺ _0.5Zn²⁺ _0.02Fe³⁺ _1.48]_BO₄. The effects of mechanical activation on cation redistribution and magnetic property of M2 have been investigated by infield Mössbauer spectroscopic measurements and verified by theoretical analysis of experimental results of Rietveld refinement of powder x-ray diffraction data in conjugation with dc magnetic study. The sample M2 is basically ferrimagnetic in nature possessing a slightly canted core surrounded by a disordered shell. It exhibits excellent memory effect in its dc magnetization measurement. The sample is capable of encoding, preserving and recalling binary numbers through magnetic field change. This property of the sample may be used to design magnetic coding and sensing devices.

Original language	English
Article number	165303
Journal	Journal of Magnetism and Magnetic Materials
Volume	487
DOIs	https://doi.org/10.1016/j.jmmm.2019.165303
State	Published - 1 Oct 2019
Externally published	Yes

Bibliographical note

Funding Information:
K. Sarkar (Ref. No: 20/12/2015(ii)EU-V) gratefully acknowledges UGC, New Delhi for junior research fellowship. R. Mondal (IVR No. 201400001001) acknowledges Department of Science and Technology (DST) , Govt. of India for providing INSPIRE fellowship. We gratefully acknowledge the support received from the UGC-DAE CSR, Indore Center for infield Mössbauer measurement and UGC-DAE CSR, Kolkata Center in connection to dc magnetic measurements. We sincerely thank Prof. V. R. Reddy of UGC-DAE CSR, Indore Center and Prof. Souvik Chatterjee of UGC-DAE CSR, Kolkata Center for their help and cooperation regarding infield Mössbauer spectroscopic study and magnetic measurements, respectively. The UPE program of UGC and the PURSE program of DST, Govt. of India are also acknowledged.

Funding Information:
K. Sarkar (Ref. No: 20/12/2015(ii)EU-V) gratefully acknowledges UGC, New Delhi for junior research fellowship. R. Mondal (IVR No. 201400001001) acknowledges Department of Science and Technology (DST), Govt. of India for providing INSPIRE fellowship. We gratefully acknowledge the support received from the UGC-DAE CSR, Indore Center for infield Mössbauer measurement and UGC-DAE CSR, Kolkata Center in connection to dc magnetic measurements. We sincerely thank Prof. V. R. Reddy of UGC-DAE CSR, Indore Center and Prof. Souvik Chatterjee of UGC-DAE CSR, Kolkata Center for their help and cooperation regarding infield Mössbauer spectroscopic study and magnetic measurements, respectively. The UPE program of UGC and the PURSE program of DST, Govt. of India are also acknowledged.

Publisher Copyright:
© 2019 Elsevier B.V.

Keywords

Magnetic coding
Magnetic property
Mössbauer spectroscopy
Nanostructures
Rietveld refinement

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10.1016/j.jmmm.2019.165303

Cite this

@article{93f47fe12c19410bbab16fecd270af2b,

title = "Presence of mixed magnetic phase in mechanically milled nanosized Co0.5Zn0.5Fe2O4: A study on structural, magnetic and hyperfine properties",

abstract = "In this paper, we have presented a detailed study on the effects of mechanical activation caused by high energy ball milling on the structural, magnetic and hyperfine properties of nanosized Co0.5Zn0.5Fe2O4 having three different particle sizes 63 (M1), 25 (M2) and 17 nm (M3) synthesized by chemical coprecipitation method. Characterization techniques like powder x-ray diffraction, high resolution transmission electron microscopy, dc magnetic measurements and M{\"o}ssbauer spectroscopic techniques have been employed to examine M1, M2 and M3 thoroughly. All the three samples are cubic spinel ferrites with Fd3-m symmetry. The lattice parameters of M1, M2 and M3 are 8.395, 8.391 and 8.375 {\AA}, respectively. The particles constituting all the three samples possess both superparamagnetic and ferrimagnetic phases at room temperature. The values of blocking temperature of M1, M2 and M3 are 204, 210 and 220 K, respectively. The values of saturation magnetization of M1, M2 and M3 at 300 and 10 K are 56.8, 55.3, 51.5 emu g−1 and 115.68, 113.84, 109.65 emu g−1, respectively. The values of coercivity for M1, M2 and M3 at 10 K are 1395, 2190 and 1950 Oe, respectively. The theory of magnetic domains has been exploited to explicate the trend in coercivity. The cation distribution of M2 is (Zn2+ 0.48Fe3+ 0.52)A[Co2+ 0.5Zn2+ 0.02Fe3+ 1.48]BO4. The effects of mechanical activation on cation redistribution and magnetic property of M2 have been investigated by infield M{\"o}ssbauer spectroscopic measurements and verified by theoretical analysis of experimental results of Rietveld refinement of powder x-ray diffraction data in conjugation with dc magnetic study. The sample M2 is basically ferrimagnetic in nature possessing a slightly canted core surrounded by a disordered shell. It exhibits excellent memory effect in its dc magnetization measurement. The sample is capable of encoding, preserving and recalling binary numbers through magnetic field change. This property of the sample may be used to design magnetic coding and sensing devices.",

keywords = "Magnetic coding, Magnetic property, M{\"o}ssbauer spectroscopy, Nanostructures, Rietveld refinement",

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AU - Majumder, S.

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N2 - In this paper, we have presented a detailed study on the effects of mechanical activation caused by high energy ball milling on the structural, magnetic and hyperfine properties of nanosized Co0.5Zn0.5Fe2O4 having three different particle sizes 63 (M1), 25 (M2) and 17 nm (M3) synthesized by chemical coprecipitation method. Characterization techniques like powder x-ray diffraction, high resolution transmission electron microscopy, dc magnetic measurements and Mössbauer spectroscopic techniques have been employed to examine M1, M2 and M3 thoroughly. All the three samples are cubic spinel ferrites with Fd3-m symmetry. The lattice parameters of M1, M2 and M3 are 8.395, 8.391 and 8.375 Å, respectively. The particles constituting all the three samples possess both superparamagnetic and ferrimagnetic phases at room temperature. The values of blocking temperature of M1, M2 and M3 are 204, 210 and 220 K, respectively. The values of saturation magnetization of M1, M2 and M3 at 300 and 10 K are 56.8, 55.3, 51.5 emu g−1 and 115.68, 113.84, 109.65 emu g−1, respectively. The values of coercivity for M1, M2 and M3 at 10 K are 1395, 2190 and 1950 Oe, respectively. The theory of magnetic domains has been exploited to explicate the trend in coercivity. The cation distribution of M2 is (Zn2+ 0.48Fe3+ 0.52)A[Co2+ 0.5Zn2+ 0.02Fe3+ 1.48]BO4. The effects of mechanical activation on cation redistribution and magnetic property of M2 have been investigated by infield Mössbauer spectroscopic measurements and verified by theoretical analysis of experimental results of Rietveld refinement of powder x-ray diffraction data in conjugation with dc magnetic study. The sample M2 is basically ferrimagnetic in nature possessing a slightly canted core surrounded by a disordered shell. It exhibits excellent memory effect in its dc magnetization measurement. The sample is capable of encoding, preserving and recalling binary numbers through magnetic field change. This property of the sample may be used to design magnetic coding and sensing devices.

AB - In this paper, we have presented a detailed study on the effects of mechanical activation caused by high energy ball milling on the structural, magnetic and hyperfine properties of nanosized Co0.5Zn0.5Fe2O4 having three different particle sizes 63 (M1), 25 (M2) and 17 nm (M3) synthesized by chemical coprecipitation method. Characterization techniques like powder x-ray diffraction, high resolution transmission electron microscopy, dc magnetic measurements and Mössbauer spectroscopic techniques have been employed to examine M1, M2 and M3 thoroughly. All the three samples are cubic spinel ferrites with Fd3-m symmetry. The lattice parameters of M1, M2 and M3 are 8.395, 8.391 and 8.375 Å, respectively. The particles constituting all the three samples possess both superparamagnetic and ferrimagnetic phases at room temperature. The values of blocking temperature of M1, M2 and M3 are 204, 210 and 220 K, respectively. The values of saturation magnetization of M1, M2 and M3 at 300 and 10 K are 56.8, 55.3, 51.5 emu g−1 and 115.68, 113.84, 109.65 emu g−1, respectively. The values of coercivity for M1, M2 and M3 at 10 K are 1395, 2190 and 1950 Oe, respectively. The theory of magnetic domains has been exploited to explicate the trend in coercivity. The cation distribution of M2 is (Zn2+ 0.48Fe3+ 0.52)A[Co2+ 0.5Zn2+ 0.02Fe3+ 1.48]BO4. The effects of mechanical activation on cation redistribution and magnetic property of M2 have been investigated by infield Mössbauer spectroscopic measurements and verified by theoretical analysis of experimental results of Rietveld refinement of powder x-ray diffraction data in conjugation with dc magnetic study. The sample M2 is basically ferrimagnetic in nature possessing a slightly canted core surrounded by a disordered shell. It exhibits excellent memory effect in its dc magnetization measurement. The sample is capable of encoding, preserving and recalling binary numbers through magnetic field change. This property of the sample may be used to design magnetic coding and sensing devices.

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