What Is a Neodymium (NdFeB) Magnet?
Sintered, bonded and hot-pressed — the three manufacturing routes behind the strongest permanent magnets on the market.
01 What you'll find
Four ways to use this site
01 / Learn
Fundamentals
What a hysteresis loop actually shows, what remanence means, why flat magnets demagnetize easily. Each topic starts from first principles.
Browse articles →
02 / Look up
Grade data
Sintered NdFeB grades N, M, H, SH, UH, EH, TH — remanence, coercivity and energy product, searchable and filterable.
Open the table →
03 / Calculate
Calculators
Surface field, pull force, magnetic moment, permeance coefficient Pc, unit conversion — engineering estimates right in the browser.
Run a calculation →
04 / Track
Market trends
PrNd oxide, DyFe and Tb price history — the raw-material cycle that drives magnet pricing.
View the charts →02 Where magnets live
Permanent magnets power the modern world
From the motor in your electric car to the MRI in a hospital — rare-earth magnets are everywhere. Explore the applications and the magnet science behind each one.
Electric motors
Magnets make motors smaller, lighter and far more efficient.
Read the article →
EV traction
High-temperature grades like UH and EH survive the drive unit.
Temperature behavior →
Wind turbines
Direct-drive generators use tons of NdFeB per turbine.
Halbach arrays →
Speakers & audio
Every loudspeaker is driven by a permanent magnet voice coil motor.
Magnetic moment →
Medical (MRI)
Imaging systems rely on precisely controlled magnetic fields.
SmCo magnets →
Data storage
Voice-coil actuators in hard drives are magnet-driven.
Inspection methods →03 Start here
Popular articles
The Four Key Magnetic Parameters: Br, Hcb, Hcj, (BH)max
Remanence, coercivity, intrinsic coercivity and maximum energy product — the first step to reading any magnet spec.
How to Read a Hysteresis Loop and Demagnetization Curve
One curve holds the whole story: where Br, Hcb, Hcj and (BH)max come from, and how heat reshapes it.
Magnet Grades Explained: What N35, N42H and N50SH Mean
The number is energy product, the letters are coercivity. Decode any NdFeB grade in seconds.
Why Magnets Hate Heat: Temperature Behavior Explained
Br falls 0.12% per °C, coercivity five times faster. Working temperature, Curie temperature and the Pc trap.
How to Specify a Magnet Requirement to a Supplier
The complete RFQ checklist: grade, dimensions, magnetization direction, coating, inspection and lead time.
04 Calculators
Engineering formulas, in your browser
Enter dimensions and a grade — get an engineering estimate. Everything runs locally; your data never leaves the device.
Surface field
Center surface flux density for cylindrical and block magnets.
B = (Br/2)·[(T+X)/√(R²+(T+X)²) − X/√(R²+X²)]Pull force
Maximum holding force against a steel plate, or between two magnets.
F = B²·A / (2μ₀)Magnetic moment
Moment for cylinder, block and ring geometries.
m = Br·V·(Pc+1)/(Pc+1.05)Permeance coefficient Pc
The shape factor that decides the operating point and temperature stability.
Pc = L·√(R(R+L)) / R²Unit conversion
T ↔ G, Oe ↔ A/m, MGOe ↔ kJ/m³.
1 T = 10⁴ G · 1 Oe = 79.58 A/mRepulsion force
Opposing-pole force between two identical magnets vs. gap.
F(z) = B₁(z)²·A/(2μ₀)05 Market trends
Follow the raw-material cycle
Rare-earth prices drive magnet costs. See the history of PrNd oxide, DyFe alloy and Tb metal.
PrNd oxide
The core raw material of rare-earth magnets, and the main driver of magnet pricing.
View chart →DyFe alloy
The heavy rare earth added to raise coercivity in high-temperature magnet grades.
View chart →Tb metal
The most expensive heavy rare earth, used in small amounts for the highest temperature grades.
View chart →
Have a magnet question?
RFQs, technical questions and feedback — we read every message. We can also help you compare grades, check a design, or find the right material for your application.
Email us: tech@magleed.com