Electromagnetic stylus, processing device, and processing method

An electromagnetic stylus, comprising:

• a tip comprising a nib arranged at an end portion thereof;
• a first magnetic core having a first through hole;
• a second magnetic core having a second through hole, arranged on an end of the first magnetic core distal from the nib, an inner diameter of the second through hole being less than an inner diameter of the first through hole, the tip sequentially running through the first through hole and the second through hole, a step structure being arranged on an end of the second magnetic core proximal to the nib;
• and
• a cartridge, a spacer being arranged on an inner wall of the cartridge, the first magnetic core and the second magnetic core at least partially received in the cartridge and being respectively positioned on two sides of the spacer, the spacer being abutted against the step structure, a height of the step structure being less than a thickness of the spacer along a lengthwise direction of the tip;
• wherein two grooves are arranged on a side, proximal to the nib, of the cartridge, and two protrusions are arranged on two sides of an end, distal from the nib, of the first magnetic core, the protrusions and the grooves being engaged with and fixed to each other.