Influence of Sintering Temperature on Magnetic Properties of Ni-Zn-Cu Ferrites Used for Mangetic Shielding in NFC

Title & Authors
Influence of Sintering Temperature on Magnetic Properties of Ni-Zn-Cu Ferrites Used for Mangetic Shielding in NFC
Ryu, Yo-Han; Kim, Sung-Soo;

Abstract
This study investigates the influence of sintering temperature on the magnetic properties and frequency dispersion of the complex permeability of Ni-Zn-Cu ferrites used for magnetic shielding in near-field communication (NFC) systems. Sintered specimens of $\small{(Ni_{0.7}Zn_{0.3})_{0.96}Cu_{0.04}Fe_2O_4}$ are prepared by conventional ceramic processing. The complex permeability is measured by an RF impedance analyzer in the range of 1 MHz to 1.8 GHz. The real and imaginary parts of the complex permeability depend sensitively on the sintering temperature, which is closely related to the microstructure, including grain size and pore distribution. In particular, internal pores within grains produced by rapid grain growth decrease the permeability and increase the magnetic loss at the operating frequency of NFC (13.56 MHz). At the optimized sintering temperature ($\small{1225-1250^{\circ}C}$), the highest permeability and lowest magnetic loss can be obtained.
Keywords
Near field communication;Magnetic shielding;Ni-Zn-Cu ferrites;Magnetic properties;
Language
Korean
Cited by
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