In everyday engineering terms, the metals most strongly attracted to magnets are iron, nickel and cobalt, plus many alloys that contain them. Steel is often magnetic, but not every steel or stainless-steel grade behaves the same way.
What Are the Three Main Magnetic Metals?
The three best-known elemental ferromagnetic metals at room temperature are iron, nickel and cobalt. These are the metals most people mean when they ask which metals are magnetic. Many useful magnetic alloys are based on iron or contain significant amounts of iron, nickel or cobalt.
For practical holding, latching and magnetic-circuit applications, carbon steel is usually a much better target material than aluminum, brass, copper or most austenitic stainless steels.
Which Metals Are Magnetic?
| Metal or alloy | Typical magnetic behavior | Engineering note |
|---|---|---|
| Iron | Strongly ferromagnetic | Strongly attracted to magnets and can retain magnetization. |
| Nickel | Ferromagnetic | One of the three familiar elemental ferromagnetic metals at room temperature. |
| Cobalt | Ferromagnetic | Strong magnetic behavior and an important constituent in several magnetic alloys. |
| Carbon steel | Usually strongly magnetic | Its iron-rich structure generally makes it a good magnetic target material. |
| Ferritic stainless steel | Usually magnetic | Grades such as the 400-series ferritic family can show strong magnetic attraction. |
| Martensitic stainless steel | Usually magnetic | Often magnetic because of its crystal structure. |
| Austenitic stainless steel | Usually weakly magnetic or essentially nonmagnetic | Common 300-series grades may become somewhat magnetic after cold working. |
| Aluminum | Paramagnetic | Only very weakly attracted in an applied field; it does not behave like iron around an ordinary permanent magnet. |
| Titanium | Paramagnetic | Weak response that is generally not noticeable with a handheld magnet. |
| Copper | Diamagnetic | Very weakly repelled by a magnetic field and not attracted like ferromagnetic metals. |
| Silver | Diamagnetic | Not attracted to an ordinary permanent magnet. |
| Gold | Diamagnetic | Not attracted to an ordinary permanent magnet. |
| Brass | Generally non-ferromagnetic | Copper-zinc alloys normally do not provide the strong attraction expected from a magnetic target. |
What Does “Magnetic” Mean?
The word magnetic can be confusing because almost all materials interact with magnetic fields to some degree. In ordinary product design, however, people usually mean ferromagnetic when they ask whether a metal is magnetic: does a permanent magnet noticeably attract it, and can the material support strong magnetic-domain alignment?
Ferromagnetic Metals
Ferromagnetic materials can develop strong internal magnetic-domain alignment. Iron, nickel and cobalt are the best-known elemental examples. Many iron-based alloys are also ferromagnetic, which is why steel plates, fasteners and machine components are commonly used as magnetic targets.
Alloy chemistry and crystal structure matter. That is why two materials that both contain iron can respond very differently to the same magnet.
Is Steel Magnetic?
Most common carbon steels are magnetic, but “steel” is too broad a term for a universal yes-or-no answer. Carbon steels and many ferritic or martensitic stainless steels are strongly attracted to magnets. Austenitic stainless steels such as common 304 and 316 grades are generally much less magnetic in the annealed condition, although fabrication and cold working can introduce some magnetic response.
Are Aluminum, Copper, Gold and Silver Magnetic?
They are not ferromagnetic. Aluminum is weakly paramagnetic, while copper, gold and silver are diamagnetic. Those effects are real physics, but they are far weaker than the attraction associated with iron or steel and normally are not useful for a magnetic latch, separator or holding application.
Why Aren’t All Metals Magnetic?
Magnetic behavior comes from electron structure, exchange interactions and the way atomic magnetic moments organize in the solid. Electrical conductivity alone does not determine whether a metal will be strongly magnetic.
For the opposite side of the question, see What Metals Are Not Magnetic? Aluminum, Copper, Brass & More.
Choosing a Steel Target for Magnet Pull Force
If a permanent magnet must hold against steel, the target material can change the measured force significantly. Target thickness, alloy, flatness, surface finish and air gap all matter. Thin steel can saturate, rough or coated surfaces introduce an effective gap, and a weakly magnetic stainless grade may produce much less force than a suitable carbon-steel plate.
That is why a catalog pull-force value should be treated as a test result under defined conditions, not a universal safe working load. For design screening, use the Magnet Pull Force Calculator and review Pull Force Explained before selecting a magnet or target material.
Why This Matters When Designing With Magnets
If a permanent magnet must hold, latch or attract a component, the target material is just as important as the magnet itself. A high-strength neodymium magnet will not create a strong holding force against aluminum, brass, copper or most austenitic stainless steels simply because those materials are not strongly ferromagnetic.
Designers should verify the exact target material and grade rather than assuming that every metal surface will work.
Frequently Asked Questions
What are the three magnetic metals?
Iron, nickel and cobalt are the three best-known elemental ferromagnetic metals at room temperature.
Is stainless steel magnetic?
Some stainless steels are magnetic and some are not strongly magnetic. Ferritic and martensitic grades are generally magnetic, while common annealed austenitic grades such as 304 and 316 are usually weakly magnetic or essentially nonmagnetic.
Is aluminum magnetic?
Aluminum is weakly paramagnetic, but it does not behave like iron or carbon steel around an ordinary permanent magnet and is generally not useful as a magnetic holding target.
Is copper magnetic?
Copper is diamagnetic and is not attracted to an ordinary permanent magnet the way iron or steel is.
Related Magnetic Material Resources
- What Metals Are Not Magnetic? Aluminum, Copper, Brass & More
- Magnet Pull Force Calculator
- Pull Force Explained
- Magnetic terminology and definitions
- Types of magnets and permanent-magnet materials
- Magnet application design best practices
- Magnet engineering resources
- Search available magnet inventory
- Request a custom magnet or magnetic solution
