Plated magnetic material for coupled coaxial magnetic integrated inductor

An apparatus, comprising:

• a substrate;
• an inductor through a thickness of the substrate, wherein the inductor comprises:
• a first via that is electrically conductive;
• a second via that is electrically conductive;
• a plug around the first via and the second via, wherein the plug comprises a first magnetic material;
• and
• a shell around the plug, wherein the shell comprises a second magnetic material that is different than the first magnetic material, and wherein the plug directly contacts the shell.

An apparatus, comprising:

• a substrate;
• an opening through a thickness of the substrate;
• a shell that lines a sidewall of the opening, wherein the shell comprises a first magnetic material that comprises one or more of cobalt, iron, or nickel;
• a plug within the shell, wherein the plug comprises a second magnetic material comprises a polymer with magnetic filler particles;
• and
• a via through the plug, wherein the via is electrically conductive.