Hopkinson Effect in Soft and Hard Magnetic Ferrites

• Authors: J. Sláma , M. Ušáková , M. Šoka , R. Dosoudil , V. Jančárik
• Languages of publication: EN

Abstracts

EN

The dependences of the susceptibility of selected spinel and hexagonal ferrites on temperature are analyzed. The susceptibility shows a peak just below the Curie temperature T_{C} due to the Hopkinson effect during the heating. The appearance of this effect is associated with a transition from the region of stable magnetization state to superparamagnetic relaxations of the magnetic particles. It is in contrast to other explanations of the Hopkinson effect. These results are compared with measured particles size and with scanning electron microscope micrographs of both types of ferrites.

Keywords

EN

75.50.Gg; 75.30.Kz; 75.30.Cr

Discipline

• 75.30.Cr: Saturation moments and magnetic susceptibilities
• 75.50.Gg: Ferrimagnetics
• 75.30.Kz: Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)(for ferroelectric phase transitions, see 77.80.B-; for superconductivity phase diagrams, see 74.25.Dw)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2017
• Volume: 131
• Issue: 4
• Pages: 762-764

Dates

published

2017-04

Contributors

author

J. Sláma

• Institute of Electrical Engineering, Faculty of Electrical Engineering and Information Technology, Slovak University of Technology, Ilkovičova 3, 812 19 Bratislava, Slovakia

author

M. Ušáková

• Institute of Electrical Engineering, Faculty of Electrical Engineering and Information Technology, Slovak University of Technology, Ilkovičova 3, 812 19 Bratislava, Slovakia

author

M. Šoka

• Institute of Electrical Engineering, Faculty of Electrical Engineering and Information Technology, Slovak University of Technology, Ilkovičova 3, 812 19 Bratislava, Slovakia

author

R. Dosoudil

• Institute of Electrical Engineering, Faculty of Electrical Engineering and Information Technology, Slovak University of Technology, Ilkovičova 3, 812 19 Bratislava, Slovakia

author

V. Jančárik

• Institute of Electrical Engineering, Faculty of Electrical Engineering and Information Technology, Slovak University of Technology, Ilkovičova 3, 812 19 Bratislava, Slovakia

References

• [1] M. Manikandan, K. Saravana Kumar, N. Aparnadevi, C. Venkateswaran, Phys. Status Solidi A 212, 2179 (2015), doi: 10.1002/pssa.201532229
• [2] T. Gheiratmand, H.R. Madaah Hosseinia, P. Davami, M. Gjoka, M. Song, J. Magn. Magn. Mater. 381, 322 (2015), doi: 10.1016/j.jmmm.2015.01.016
• [3] V. Zhukova, M. Ipatov, A. Talaat, A. Zhukov, Phys. Status Solidi C 11, 1130 (2014), doi: 10.1002/pssc.201300715
• [4] J. Slama, M. Šoka, A. Grusková, A. Gonzalez, V. Jančárik, J. Electr. Eng. 62, 239 (2011), doi: 10.2478/v10187-011-0038-7
• [5] E. Ušák, M. Šoka, M. Ušáková, E. Dobročka, Acta Phys. Pol. A 126, 68 (2014), doi: 10.12693/APhysPolA.126.68
• [6] A. Grusková, J. Sláma, M. Ušáková, M. Šoka, R. Dosoudil, J. Degmová, Acta Phys. Pol. A 118, 780 (2010), doi: 10.12693/APhysPolA.118.780
• [7] A.S. Aronin, G.E. Abrosimova, A.P. Kiselev, V. Zhukova, R. Varga, A. Zhukov, Intermetallics 43, 60 (2013), doi: 10.1016/j.intermet.2013.07.010
• [8] M. Manikandan, C. Venkateswaran, J. Magn. Magn. Mater. 358-359, 82 (2014), doi: 10.1016/j.jmmm.2014.01.041
• [9] H. Pfeiffer, W. Schüppel, J. Magn. Magn. Mater. 130, 92 (1994), doi: 10.1016/0304-8853(94)90661-0

Identifiers

DOI

10.12693/APhysPolA.131.762