Accessory with a magnetic relay structure for wireless power transfer

A cover for an electronic device having a front face, the cover comprising:

• a rear cover portion configured to receive the electronic device;
• a front cover portion configured to move relative to the rear cover portion and configured to cover the front face of the electronic device;
• a first ferrimagnetic core embedded in the front cover portion, wherein the first ferrimagnetic core is configured to direct received magnetic flux from a first coil in the electronic device to a second coil in an additional electronic device;
• a second ferrimagnetic core embedded in the front cover portion, wherein the second ferrimagnetic core is configured to direct received magnetic flux from a third coil in the electronic device towards a fourth coil in the additional electronic device;
• a first permanent magnet in the front cover portion;
• a second permanent magnet in the front cover portion;
• a first shielding structure interposed between the first ferrimagnetic core and the first permanent magnet;
• and
• a second shielding structure interposed between the second ferrimagnetic core and the second permanent magnet.

An accessory for an electronic device, the accessory comprising:

• a dielectric layer that is interposed between the electronic device and an additional electronic device during wireless power transfer operations between the electronic device and the additional electronic device;
• a first magnetic alignment structure;
• a first ferrimagnetic core in the dielectric layer that is interposed between a second ferrimagnetic core in the electronic device and a third ferrimagnetic core in the additional electronic device when the first magnetic alignment structure is magnetically coupled to a second magnetic alignment structure in the electronic device and a third magnetic alignment structure in the additional electronic device;
• and
• a shielding structure in the dielectric layer, wherein the shielding structure is interposed between the first ferrimagnetic core and the first magnetic alignment structure.