Magnetic nanocomposites could help shrink the components that power computer chips
When you think about making computer chips better, you probably think about transistors. My colleagues and I focused on a less visible part of the problem: the components that deliver power to those transistors. A chip needs more than electricity. It needs electricity supplied at the right voltage, with fluctuations kept under control. Making the hardware that does this smaller is an important…
Computer chips rely on transistors, but their power delivery components are equally crucial. These components must supply electricity at the right voltage while keeping fluctuations under control. To address the challenge of shrinking these components, scientists at the University of Florida fabricated tiny magnetic devices called stripline microinductors using a composite of nickel and iron oxide nanoparticles. This nanocomposite enabled the devices to exhibit more than twice the inductance of comparable air-core devices.
Inductors play a vital role in voltage regulators, which convert incoming electrical supply into the voltage required by circuits. In switching regulators, inductors temporarily store energy in a magnetic field and help control changes in current. Reducing the dimensions of inductors generally reduces their inductance, so researchers explored methods to incorporate magnetic material into compact structures.
One approach is to add magnetic material around the conductor, which changes how magnetic flux develops and allows a compact structure to provide more inductance.
The researchers used a process called electroinfiltration to create a magnetic nanocomposite. They started with iron oxide nanoparticles and electrochemically deposited nickel into the spaces between them, resulting in a composite where particles were embedded within a metal matrix. This method allowed the formation of the composite where it was needed during fabrication.
The nanocomposite was then incorporated into stripline microinductors, which featured an electrically insulated copper strip between bottom and top magnetic layers. This configuration provided a magnetic return path around the conductor, increasing the magnetic flux linked to it.
The resulting devices demonstrated approximately 1.6 nanohenries of inductance, which was more than twice the inductance of comparable air-core devices. This increase is significant, as small inductances are relevant to circuits operating at high frequencies. Additionally, the optimized device achieved a peak quality factor (Q) of 5.3 at 150 megahertz, representing a 58% increase over the original process. This enhancement indicates a balance between inductive behavior and electrical loss at a particular frequency.
While the study establishes a foundation for integrating compact power-conversion components into semiconductor devices, further work is needed to address factors such as heating, reliability, performance in complete converters, and fabrication yield. Nonetheless, the research highlights the potential of magnetic nanocomposites in shrinking computer chip components that power their transistors.
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