Magnets move objects in different ways because not all materials respond to magnetic fields the same way. Whether an object gets pulled toward a magnet, pushed away, slowed down, or completely ignored depends on what’s happening at the atomic level inside that object. The key factor is how the electrons in a material behave when a magnetic field reaches them.
How Magnets Create Force
Every magnet is surrounded by an invisible magnetic field. Outside the magnet, field lines flow from the north pole toward the south pole. When another magnetic object enters this field, the force it experiences depends on how its own magnetic field lines up with the external one.
When two magnets are brought together with opposite poles facing (north to south), their fields align and the magnets snap toward each other. Flip one magnet around so two identical poles face each other, and the fields oppose one another, pushing the magnets apart. This is the most familiar example of magnets moving objects in different directions, but it’s only one piece of the puzzle.
The strength of this force drops off quickly with distance. For a typical bar magnet or fridge magnet, the field weakens roughly as the cube of the distance. Double the gap between a magnet and an object, and the force drops to about one-eighth of what it was. This is why magnets seem to “suddenly” grab onto things when they get close enough, rather than pulling steadily from far away.
Why Some Materials Stick and Others Don’t
Materials fall into three broad categories based on how their electrons react to a magnetic field, and this classification explains most of what you see magnets do in everyday life.
Ferromagnetic materials are the ones magnets visibly attract: iron, nickel, cobalt, and alloys containing them. Inside these materials, atoms naturally group into tiny regions called magnetic domains. Each domain is like a miniature magnet with its own north and south pole. In an unmagnetized piece of iron, these domains point in random directions and cancel each other out, so the metal doesn’t act like a magnet on its own.
When you bring a magnet near a piece of iron, something changes. Domains that happen to be aligned with the external field grow larger at the expense of neighboring domains that point in other directions. Domain walls literally shift position. At stronger field strengths, the remaining domains rotate to line up with the field. Once enough domains align, the iron itself becomes a temporary magnet, and the two attract. This is why a magnet can pick up a paperclip, and then that paperclip can pick up another one: the first clip has become magnetized by the field.
Paramagnetic materials like aluminum, platinum, and oxygen have unpaired electrons that create small magnetic moments, but those moments are randomly oriented. An external magnetic field nudges them into partial alignment, producing a very weak attraction. You’d never notice it with a handheld magnet. It takes sensitive instruments or extremely strong fields to detect the effect.
Diamagnetic materials like copper, water, wood, and bismuth actually get pushed away by magnets, though the force is usually too faint to see. In these materials, electrons are paired up and their magnetic effects cancel. When a magnetic field arrives, the electron orbits adjust slightly to oppose the incoming field. The result is a tiny repulsive force. With powerful enough magnets, this becomes visible. Researchers have famously levitated strawberries, frogs, and water droplets using strong diamagnetic repulsion.
What Happens Inside Atoms
The root of all magnetic behavior is electron motion. Electrons contribute to magnetism in two ways: they orbit the nucleus, and they spin on their own axes. Both of these motions create tiny magnetic fields. The combination of spin and orbital magnetic moments across all the electrons in an atom determines whether that atom is magnetically “loud” or “silent.”
When electrons are paired (one spinning up, the other spinning down in the same orbital), their magnetic moments cancel. Materials made of atoms with fully paired electrons tend to be diamagnetic. Materials with unpaired electrons have leftover magnetic moments that can respond to external fields, making them paramagnetic or, in extreme cases, ferromagnetic. Ferromagnetic materials are essentially paramagnetic materials on a much larger scale. Their unpaired electron moments are so strongly coupled to their neighbors that entire domains of atoms spontaneously align with each other, even without an external field present.
How Magnets Slow Down Conductors
One of the more surprising things magnets do is slow objects down without touching them. Drop a strong magnet through a copper pipe and it falls noticeably slower than it would through air, even though copper isn’t attracted to magnets at all.
This happens because of a principle called electromagnetic induction. When a magnet moves past a conducting material, the changing magnetic field generates circulating electric currents inside the metal. These are called eddy currents. Those currents create their own magnetic fields, and those fields always oppose the motion that created them. The result is a braking force that resists the magnet’s movement. The faster the magnet moves, the stronger the braking effect.
This is the same principle behind magnetic braking systems in roller coasters, trains, and some exercise bikes. No physical contact is needed, and there’s no friction or wear. The magnet and the conductor never touch, yet the object slows down as if moving through invisible molasses.
Temperature Changes Everything
Heat can completely alter how a material responds to a magnet. Every ferromagnetic material has a specific temperature, called its Curie temperature, above which it loses its magnetic properties entirely and becomes merely paramagnetic.
For iron, this happens at 770°C. Nickel loses its ferromagnetism at a much lower 354°C. Cobalt holds on until 1,115°C. The neodymium magnets commonly sold as “super magnets” have Curie temperatures between 310°C and 340°C, which is why they can be permanently damaged by excessive heat. At the atomic level, thermal energy becomes strong enough to randomize the domain alignment that makes ferromagnetism possible. The domains still exist in theory, but they can no longer maintain their organized structure against the constant jostling of heat.
Gadolinium is an interesting case with a Curie temperature of just 19°C. At room temperature it’s barely ferromagnetic. Cool it slightly below room temperature and it behaves like iron near a magnet. Warm it a few degrees and the effect vanishes.
Superconductors and Perfect Repulsion
At the opposite extreme of temperature, superconductors cooled below their critical temperature do something no ordinary material can: they completely expel magnetic fields from their interior. This is called the Meissner effect, and it goes beyond simple diamagnetism.
A normal diamagnetic material weakly opposes a magnetic field. A superconductor cancels it entirely. Electrical currents circulate on the surface of the superconductor with zero resistance, generating a magnetic field that perfectly mirrors and repels the approaching magnet. The result is stable levitation. A magnet placed above a superconductor will hover in midair, locked in place, as long as the superconductor stays cold enough. This isn’t just a weak push. The magnet is rigidly suspended and resists being moved in any direction.
Magnetic Fields in Liquids
Ferrofluids are liquids loaded with nanoscale magnetic particles suspended in a carrier fluid like oil. When a magnet is brought near, the particles try to follow the field lines, but surface tension and gravity push back. The competition between these forces creates the dramatic spike patterns ferrofluids are famous for.
Once the magnetic field reaches a critical strength, the flat surface of the fluid becomes unstable. Peaks rise up in a regular hexagonal pattern, with taller spikes forming where the field is strongest. The magnetic force pulls the fluid upward along field lines while surface tension tries to minimize the surface area and gravity pulls the fluid back down. Changing the magnet’s position, strength, or orientation reshapes the spikes in real time, which is why ferrofluids seem almost alive when they interact with magnets.
Why Moving Charges Matter
At the most fundamental level, magnetic forces only act on moving electric charges. A stationary charge sitting in a magnetic field feels no magnetic force at all. It’s only when charges move that the magnetic field can push on them, and it pushes sideways, perpendicular to both the direction the charge is moving and the direction of the field. The strength of this sideways push depends on the charge’s speed, the field’s strength, and the angle between them.
This is why magnetism and electricity are deeply connected. Every magnetic interaction, from a fridge magnet holding up a grocery list to an MRI machine imaging your brain, traces back to moving charges. Inside a permanent magnet, those moving charges are electrons orbiting nuclei and spinning on their axes. Inside an electromagnet, they’re electrons flowing through a wire. The reason magnets move different objects in different ways ultimately comes down to how the moving charges inside the object respond to the moving charges creating the magnetic field.