The "magnetic" cornerstone of electronic devices: Micro magnets support the lightweight revolution of 3C products
2025-10-21
From mobile phone vibration horses to smartwatch sensors, miniaturized and high-performance magnets have become the core driving force for the iteration of consumer electronic devices. With the popularization of foldable phones and wearable devices, more stringent requirements have been put forward for the volume, magnetic performance and stability of magnets. Rare earth magnetic materials such as neodymium iron boron, with their unique advantages, have become indispensable basic materials in the 3C industry.
The core demands of consumer electronics for magnets are concentrated in three dimensions: "small size, strong magnetic force, and high stability". The magnetic energy product of neodymium iron boron magnets is more than ten times that of ferrite. A miniature neodymium iron boron magnet with a diameter of 5 millimeters and a thickness of 2 millimeters can generate sufficient magnetic force to drive the vibration motor of a mobile phone, reducing the motor volume by 40% and freeing up more space for the layout of internal components of the mobile phone. In foldable screen mobile phones, the magnetic hinge composed of neodymium iron boron magnets can achieve more than 200,000 opening and closing times, and the magnetic force attenuation rate is less than 5%, ensuring the long-term durability of the device.
The explosion of wearable devices has further driven the upgrading of magnet technology towards refinement. The heart rate sensor of a smartwatch uses neodymium iron boron magnets to generate a stable magnetic field. Combined with photoelectric detection technology, it can achieve real-time monitoring of physiological data such as heart rate and blood oxygen. The stability of its magnetic performance directly affects the detection accuracy. Research and development data from a certain electronic component enterprise shows that sensors using high-grade neodymium iron boron magnets can control heart rate detection errors within ±1 beats per minute, which is far superior to products using ordinary magnets.
The processing flexibility of magnets also provides the possibility for innovation in consumer electronics. Neodymium iron boron can be made into various forms such as thin sheets, rings and irregular shapes through processes like cutting and grinding, to meet the design requirements of different equipment. In wireless charging devices, the magnetic field focusing structure composed of annular neodymium iron boron magnets can increase the charging efficiency to over 90% and reduce the impact of electromagnetic radiation on the human body. With the continuous upgrading of 3C products towards intelligence and portability, it is estimated that the global market size of neodymium iron boron for consumer electronics will reach 12 billion US dollars in 2025, with a compound annual growth rate maintained at over 15%.
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