Busting Common Misconceptions About Magnetics
By Radial Magnets
Magnetics is one of the most widely used yet misunderstood areas of modern engineering. From electric vehicles to smartphones, magnets are everywhere—but myths and misconceptions still shape how people think about them.
Let’s break down some of the most common misunderstandings and replace them with clear, science-backed facts.
Myth #1: “All Metals Are Magnetic”
Reality:
Only certain metals are strongly magnetic—primarily iron, nickel, and cobalt, along with their alloys.
Materials like aluminum, copper, brass, and stainless steel (in many cases) are not magnetic. Some may exhibit very weak magnetic behavior (paramagnetism), but not enough for practical applications.
Why it matters:
Buyers often assume magnets will stick to any metal surface. In real-world applications, this can lead to design failures or incorrect product selection.
Myth #2: “Stronger Magnets Are Always Better”
Reality:
Magnet strength must match the application—not exceed it unnecessarily.
- Overly strong magnets can:
- Damage sensitive electronics
- Create safety hazards (pinch risks)
- Increase costs without added value
Example: A high-grade N52 magnet isn’t always the right choice if an N35 or ferrite magnet meets the requirement.
Why it matters:
Engineering efficiency comes from optimization—not maximum force.
Myth #3: “Magnets Last Forever”
Reality:
Magnets can lose strength under certain conditions:
- High temperatures (exceeding grade limits)
- Physical damage or shock
- Corrosion (especially uncoated Neodymium magnets)
- Exposure to opposing magnetic fields
For example, standard Neodymium magnets begin to degrade above ~80°C unless higher temperature grades (like SH, UH) are used.
Why it matters:
Proper material selection and coatings (NiCuNi, Epoxy, etc.) are critical for longevity.
Myth #4: “You Can Magnetize Any Metal”
Reality:
Only ferromagnetic materials can be permanently magnetized.
This is due to their atomic domain structure, which allows magnetic alignment. Materials like copper or aluminum lack this structure and cannot hold magnetization.
Why it matters:
This misconception often appears in manufacturing requests—especially when customers want custom “magnetized” parts made from non-magnetic materials.
Myth #5: “Gauss Rating Tells You Everything About a Magnet”
Reality:
Gauss (magnetic field strength at a point) is just one piece of the puzzle.
Other critical factors include:
- Pull force (lbs or kg)
- Magnet size and geometry
- Material grade (N35, N42, etc.)
- Air gap and application environment
Two magnets with similar surface Gauss can perform very differently in real applications.
Why it matters:
Relying only on Gauss can lead to incorrect purchasing decisions and performance issues.
Myth #6: “Magnets Only Attract”
Reality:
Magnets both attract and repel.
- Opposite poles → Attract
- Same poles → Repel
This principle is the foundation of:
- Electric motors
- Magnetic levitation systems
- Sensors and actuators
Why it matters:
Understanding repulsion is just as important as attraction—especially in advanced engineering applications.
Myth #7: “Neodymium Magnets Are Indestructible”
Reality:
Neodymium magnets are extremely brittle.
Despite their strength, they can:
- Crack or shatter upon impact
- Chip their coating easily
- Break if allowed to snap together
Why it matters:
Handling, packaging, and spacing are critical—especially in logistics and warehousing environments.
Final Thoughts: Why These Myths Matter
Misconceptions about magnetics don’t just cause confusion—they can lead to:
- Poor product performance
- Safety risks
- Increased costs
- Supply chain inefficiencies
At Radial Magnets, education is just as important as supply. Understanding the fundamentals ensures you choose the right magnet for the right application—every time.