High-performance permanent magnets engineered to control precise magnetic susceptibility and deliver maximum torque, hold, and longevity.
A technical white paper on high-precision rare-earth magnetic solutions.
In high-tech industrial manufacturing, magnetic susceptibility is a critical physical quantity that defines how a material behaves when subjected to an external magnetic field. Mathematically expressed as the ratio of magnetization (M) to the applied magnetic field strength (H), magnetization susceptibility determines the performance parameters of permanent magnet assemblies used in electric vehicle drivetrains, robotics, medical devices, and aviation control systems.
As a leading national high-tech manufacturer, Zhejiang Laysun Magnetics Ltd. specializes in customizing magnetization susceptibility profiles of permanent NdFeB magnets. By optimizing chemical compositions, grain alignment, and sintering parameters, we deliver magnets that provide consistent magnetic fluxes under highly dynamic stress and high-temperature environments. Controlling susceptibility is not merely about sourcing raw magnets; it is about engineering predictable hysteresis behavior, minimizing demagnetization risks, and enhancing operational efficiencies in high-precision electromagnetic devices.
Magnetic materials are generally classified based on their magnetic susceptibility ($\chi$). While diamagnetic and paramagnetic materials exhibit small, linear susceptibility, ferromagnetic and ferrimagnetic materials—such as Neodymium Iron Boron (NdFeB)—display large, complex susceptibility values that depend highly on their magnetic history (hysteresis) and temperature. In high-performance engineering, understanding and controlling the volumetric susceptibility and coercivity of sintered NdFeB is essential. It prevents eddy-current losses in motor rotors and maintains permanent field configurations in voice coil motors (VCMs) and automated steering systems.
Watch our advanced manufacturing lines, quality test laboratories, and logistics operations.
Founded at the turn of the millennium, Zhejiang Laysun Magnetics Ltd. has rapidly evolved from a visionary startup into an industry pacesetter in permanent magnet production. Our state-of-the-art manufacturing facility, sprawling across 100,000 square meters in Suining, Sichuan, is equipped with automated vacuum sintering ovens, rapid-quench strip casting machines, and automated multi-pole magnetization lines.
Backed by over two decades of technical expertise, our team of 300+ engineers, researchers, and operators work in unison to supply over 5,000 tons of high-grade rare earth magnets annually. We operate on the four core pillars of our company: Quality, Credibility, Technology, and Innovation. This technical commitment guarantees that every batch of neodymium disc, block, ring, or custom-shaped magnets meets stringent global tolerances.
Our relentless pursuit of metallurgical and physical advancement is not just about staying ahead of the curve; it is about establishing new global standards for magnetic optimization. By utilizing advanced Grain Boundary Diffusion (GBD) technology, we reduce heavy rare earth (Dysprosium and Terbium) consumption while significantly boosting the intrinsic coercivity ($H_{cj}$) and controlling the magnetic susceptibility curve of our magnets.
This allows us to support next-generation green tech industries. From heavy-duty wind turbine generators to sub-miniature medical imaging devices, we engineer solutions that perform efficiently under temperatures exceeding 200°C without undergoing irreversible demagnetization.
How our custom magnetization susceptibility engineered magnets drive global industrial sectors.
High-torque servo motors require NdFeB magnets with exceptionally uniform magnetization. Our custom-aligned rings and segments ensure smooth, cogging-free rotation, optimizing robotic arm precision and battery life in AGVs.
Unmanned aerial vehicles (UAVs) require high power-to-weight ratios. Zhejiang Laysun Magnetics provides ultra-lightweight, high-coercivity magnets that withstand continuous vibration and rapid thermal variations in drone propulsion motors.
Traction motors operate under demanding workloads. Our GBD-treated neodymium blocks maintain low thermal demagnetization rates and precise magnetic susceptibility parameters, guaranteeing vehicle range and acceleration stability.
Brushless motor systems in heavy-duty construction tools rely on permanent neodymium arc segments. Optimized magnetic susceptibility ensures linear torque delivery, prevents heat buildup, and extends tool lifetimes.
From Magsafe-compatible phone rings to acoustic drivers in premium headphones, our thin-gauge NdFeB magnets provide concentrated flux fields in minimal space envelopes, supporting modern, compact device design.
In high-efficiency compressor motors for air conditioners, refrigerators, and smart home appliances, our cost-effective permanent magnets minimize carbon footprints and lower daily power consumption.
Why Zhejiang Laysun Magnetics is the preferred partner for global OEMs and tier-1 suppliers.
China is home to the world's most robust rare earth resource supply chain, processing over 70% of global light and heavy rare earth elements. Located in Suining, Sichuan—a strategic node in China's rare earth processing corridors—Zhejiang Laysun Magnetics enjoys direct access to key raw materials, including Neodymium (Nd), Praseodymium (Pr), Dysprosium (Dy), and Terbium (Tb). This proximity insulates our operations from international market price volatility and ensures uninterrupted bulk production for our global clients.
Our 100,000 m² factory integrates automated hydrogen decrepitation (HD), jet milling under inert nitrogen atmospheres, and isostatic pressing machines. This automated setup optimizes manufacturing, reduces human error, and ensures stable magnetic parameters. Consequently, we offer premium sintered magnets at competitive prices, making us a strategic sourcing partner for global enterprises.
Headquartered in Hangzhou, Zhejiang, we leverage regional transport infrastructure to offer streamlined export operations. Whether shipping via air freight for high-priority prototypes or maritime transport from Ningbo/Shanghai ports for container-level orders, we guarantee swift delivery. We also offer robust custom design services. Our laboratory can model magnetic fields, optimize shape configurations, and deliver custom prototypes in as little as 7 to 10 days.
Every magnet we supply complies with international standards to ensure reliability in critical industrial systems.
At Zhejiang Laysun Magnetics, quality assurance is integrated into every phase of production, from raw material inspection to final flux packaging. We hold certifications for ISO9001, ISO14001, OHSAS18001, CE, and TS/IATF16949, meeting the high standards required by the automotive, medical, and aerospace industries.
Expert technical answers regarding NdFeB permanent magnets, custom properties, and B2B sourcing.
Magnetization susceptibility ($\chi$) measures how a material magnetizes in response to an external magnetic field. For permanent magnets like NdFeB, susceptibility characteristics determine how resistant the magnet is to external demagnetizing fields. By adjusting magnetization susceptibility during the sintering phase, engineers can ensure that the magnet maintains its magnetic output under high mechanical stresses, heat loads, and reverse electromagnetic forces.
We use automated vacuum induction furnaces, nitrogen gas jet milling, and precise computer-controlled alignment presses. By keeping particle sizes uniform (3-5 microns) and checking oxygen levels in our vacuum lines, we minimize variation. In addition, our QA laboratory tests every batch using hysteresisgraphs and vibrating sample magnetometers (VSM) to confirm consistent magnetic performance.
Yes, we specialize in custom manufacturing. We supply a wide range of shapes, including arcs, blocks, cylinders, rings, discs, and complex custom geometries. Using specialized magnetization fixtures, we can program specific magnetization patterns—such as axial, diametrical, multi-pole radial, or Halbach arrays—to meet the requirements of your application.
Custom prototype samples are typically completed within 7 to 10 days. For large-scale production runs, our standard lead time is 20 to 30 days, depending on order size and custom plating requirements. Because we manage a raw material reserve, we can accelerate lead times for long-term contract clients.
Sintered NdFeB contains iron and is naturally prone to corrosion. To protect them, we offer high-grade surface coatings, including Nickel-Copper-Nickel (NiCuNi), Zinc (Zn), Epoxy, Gold, Chemical Vapor Deposition (CVD) Parylene, and specialized passivation treatments. These coatings help the magnets withstand salt spray testing, chemical exposure, and high humidity.
We manufacture a comprehensive array of neodymium magnet grades from N35 up to N55. We also offer high-coercivity grades, including M, H, SH, UH, EH, and AH series. Max operating temperatures range from 80°C for standard N-series up to 220°C for AH-series, which are designed for high-temperature EV and wind power applications.
Partner with Zhejiang Laysun Magnetics Ltd. Contact our technical team today to receive a comprehensive quote and customized engineering support within 24 hours.
“Accelerating global electrification through advanced magnetic susceptibility control and high-performance NdFeB manufacturing.”
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