1K107 Nanocrystalline Magnetic Cores for Power Efficiency

What Are 1K107 Nanocrystalline Magnetic Cores?

1K107 is an iron-based nanocrystalline soft magnetic alloy produced by rapid solidification followed by controlled nanocrystallization annealing. The final microstructure consists of ultrafine grains of roughly 10-15 nm embedded in an amorphous matrix. This structure gives the material a combination of properties that ferrite and silicon steel cannot offer at the same time: high saturation flux density, very high initial permeability, low coercivity, and extremely low core loss at medium and high frequencies.

For engineers designing power conversion equipment, the practical result is a smaller core for the same power handling, lower temperature rise, and simpler thermal management. 1K107 cores are supplied in toroidal, rectangular, C-shape and cut-core forms, and are widely used in power transformers, common mode chokes, current transformers and magnetic sensors.

Key Magnetic Properties of 1K107

High saturation flux density (about 1.25 T), roughly double that of ferrite, which helps reduce core volume and winding turns.

High initial permeability (up to 80,000 and above depending on heat treatment), giving excellent sensitivity for current transformers and measurement applications.

Low core loss across the 1 kHz to 100 kHz range, which lowers operating temperature and improves efficiency in switch-mode power supplies.

High Curie temperature (above 500 °C), ensuring stable magnetic performance over a wide working temperature range.

Good anti-interference behaviour, with electromagnetic compatibility benefits for precision electronic equipment.

Typical Applications

Power Electronics

High-frequency transformers and inductors in inverters, chargers and switch-mode power supplies benefit from low core loss, which reduces energy waste and allows higher switching frequencies with smaller magnetic components.

Electric Vehicles

EV chargers, traction converters and DC-DC converters use nanocrystalline cores to improve efficiency and reduce the size of onboard magnetic components, supporting faster charging and extended driving range.

EMI Suppression and Current Sensing

Common mode chokes with 1K107 cores suppress electromagnetic interference in motor drives and power supplies. Precision current transformers for electric meters, leakage protection switches and power transmission monitoring rely on the core's high permeability and linearity.

Medical and Telecommunications

MRI systems and communication equipment use nanocrystalline cores for stable imaging performance and improved signal integrity in high-frequency circuits.

Core Specification Overview

Dimensions shown are indicative. Additional sizes and shapes can be produced to meet specific customer requirements; confirm tolerances and stacking factor with the supplier before mass production.

Selection and Handling Considerations

When selecting a 1K107 core, evaluate operating frequency, required flux density and temperature environment together. Because nanocrystalline material is mechanically hard but brittle, avoid sharp impacts during assembly and use proper winding tooling. For cut cores, keep the mating surfaces clean and control the air gap to maintain the designed inductance and temperature behaviour.

Frequently Asked Questions

Q: What does the 1K107 designation mean?
1K107 is a grade code for an iron-based nanocrystalline soft magnetic alloy used for magnetic cores. Always verify the full datasheet from the manufacturer for exact loss, permeability and saturation values before design.

Q: How does 1K107 compare with ferrite cores?
1K107 offers higher saturation flux density (about 1.25 T versus 0.3-0.5 T for ferrite) and much higher permeability, allowing smaller cores and fewer turns. Ferrite remains competitive at very high frequencies above several hundred kilohertz and at very low cost.

Q: Can 1K107 cores be used in common mode chokes?
Yes. High permeability and low loss across the 1 kHz to 100 kHz range make 1K107 a common choice for common mode chokes in power supplies, motor drives and renewable energy inverters.

Q: Are nanocrystalline cores stable at high temperatures?
Nanocrystalline cores maintain stable performance over a wide temperature range, and the high Curie temperature gives good margin for demanding environments. The finished core can be coated or boxed for protection against humidity and mechanical damage.

Q: How is core loss of 1K107 measured?
Core loss is normally measured with sinusoidal excitation at the rated frequency and flux density, following test methods consistent with IEC 60404-6 for soft magnetic materials. Confirm the test frequency and flux density used in the datasheet before comparing grades.

Q: Can core dimensions be customized?
Yes. Additional sizes, shapes and gap configurations can be manufactured according to customer requirements. Provide the target inductance, operating frequency and available winding window to the supplier for a customized design.