Abstract
For developing subminiature and highly integrated multilayer inductors, soft magnetic powder was used; however, its ferrite magnetic component is characterized by high resistivity and reduced direct current saturation, leading to the deterioration of the inductor under high currents. Therefore, herein, to improve the electromagnetic properties of thin-film inductors, Fe nanopowder was used to increase the volume fraction of magnetic sheets. Surface treatment was performed by using silane coupling agents, which improved the bonding strength and dispersibility of the Fe nanopowder with a heterogeneous epoxy binder. For uniform surface treatment on the nanopowder, the silane-treated powder was aged for 24 h, at a temperature of 3 °C. The surface-treated Fe nanopowder was used with a mixing ratio of the soft magnetic powder (coarse:fine:nano) of 7:2.5:0.5 wt.%; this was successful in producing a flexible and highly densified magnetic sheet. As a result, the volume fraction of the magnetic sheet for thin-film inductors to which a low-temperature aging-treated nanopowder was applied was significantly improved.
Highlights
Miniaturization of electronic components, including smartphones and TVs, has been accelerating in recent years
The magnetic sheet was prepared at the optimum mixing ratio, to evaluate the volume fraction and physical properties of the sheet
The bulk magnetic material was manufactured in toroidal form, to confirm the optimum magnetic properties and volume fraction
Summary
Miniaturization of electronic components, including smartphones and TVs, has been accelerating in recent years. Smartphones, in particular, require miniaturization and high characterization of many electronic components to simultaneously realize slimness, as well as various convenience functions. More than 100 power inductors are used in smartphones as filters in combination with capacitors [1,2]. As the mounting area decreases and functions increase, electronics component companies are focusing on the development of subminiature and highly integrated multilayer inductors [3–7]. To improve the electromagnetic properties of the inductor, many researchers have made an effort to.
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