Permalloy: Reshaping the new landscape of electromagnetic applications with its low-loss characteristics

As power electronics evolve toward higher frequencies, smaller sizes, and higher efficiency, material loss has become a key bottleneck hindering industry breakthroughs. Permalloy, with its unique low-loss properties, is becoming a leader in reducing losses in transformers, inductors, microwave devices, and other fields, opening up new paths to improving energy efficiency.

The “ultimate compressor” of hysteresis loss

Permalloy’s hysteresis loss coefficient is over 30% lower than that of traditional silicon steel. This breakthrough is the result of dual optimization of its composition and processing. For example, 1j85 alloy, with a nickel content of up to 79%, is refined to the nanometer level through vacuum melting and high-temperature hydrogen annealing, significantly reducing the resistance to magnetic domain wall movement. Under test conditions of 50kHz/100mT, its power loss is less than 700kW/m³, only one-third that of silicon steel. This characteristic makes it an ideal material for components such as high-frequency transformers and common-mode inductors. A new energy vehicle motor controller using 1J85 cores saw a 42% reduction in no-load losses and a 2.1 percentage point increase in system efficiency.

Smart Suppressor of Eddy Current Losses

Permalloy achieves “active power consumption reduction” in the face of high-frequency electromagnetic fields through compositional manipulation. Adding 2%-5% molybdenum to molypermalloy increases the resistivity to 60μΩ·cm, a 50% improvement over conventional alloys. A 50nm nanofilm material developed by Shanghai Jiao Tong University exhibits eddy current losses that are only one-eighth that of bulk material at a frequency of 10MHz. This characteristic is particularly evident in 5G base station filters and satellite communication microwave devices: one communications equipment manufacturer, after adopting molypermalloy magnetic rings, reduced device temperature rise by 15°C and increased signal transmission efficiency by 18%.

“Stable Guardian” of Losses in the Full Temperature Range

Permalloy’s loss characteristics exhibit exceptional temperature stability. Its temperature coefficient of magnetic permeability is as low as -0.002%/°C, maintaining consistent performance over a wide temperature range from -40°C to +200°C. In downhole oil exploration instruments, magnetic sensors made of 1J67 alloy have maintained a permeability fluctuation of less than 0.5% for 3,000 hours of continuous operation at 200°C, ensuring reliable data acquisition. This stability makes it a preferred material for equipment used in extreme environments, such as aerospace and deep-sea exploration.

From new energy vehicles to 5G communications, from industrial automation to medical imaging, permalloy’s low-loss properties are reshaping the application boundaries of electromagnetic materials. With breakthroughs in processes such as nanocrystallization and magnetic field heat treatment, its loss performance continues to set new industry records. For modern industry striving for extreme energy efficiency, permalloy is not only an alternative material upgrade but also a key to unlocking a green energy future.