3. • Ferromagnetism is a property of many
materials like iron. They are magnets, so they
are attracted to,or pulled towards other
magnets. In physics, there are many different
type of magnetism.
• Ferromagnetism is the strongest one. It is used
every day in many technological objects,
like television screens and credit cards
• Ferromagnetisme adalah sebuah fenomena dimana sebuah material
dapat mengalami magnetisasi secara spontan, dan merupakan satu
dari bentuk kemagnetan yang paling kuat. Fenomena inilah yang
dapat menjelaskan kelakuan magnet yang kita jumpai sehari-hari.
4. Kerr micrograph of the metal surface showing magnetic
domains, with red and green stripes denoting opposite
magnetization directions.
ferromagnetic material is divided into tiny regions called magnetic domains (also
known as Weiss
domains). Within each domain, the spins are aligned, but (if the bulk material is in
its lowest energy configuration,
i.e. unmagnetized), the spins of separate domains point in different directions and
their magnetic fields cancel
out, so the object has no net large-scale magnetic field.
characteristics
5. • An everyday example of ferromagnetism is a
refrigerator magnet used to hold notes on a
refrigerator door. The attraction between a
magnet and ferromagnetic material is "the
quality of magnetism first apparent to the
ancient world, and to us today".
11. Do magnets ever lose their
magnetism?
• 1) Via shock
• 2) Via heat: ferromagnet materials will lose their magnetism
if heated above a point known as the Curie temperature
• 3) Via a demagnetizing magnetic field
12. 1. due to the spins of electrons in the same direction
2. One of iron,nickel,and cobalt
3. Temperature Dependence of Ferromagnetism,if it reach
the Curie temperature,the spins of electrons will not in the
same direction, the ferromagnetism change to be
paramagnetism
13. vocabularies
Dipoles:electric dipoles(kutub + dan -) is a pair ofelectric charges with the
same magnitude but with the opposite type of charge (positive and negative) and are separated by
a small distance from each other.
magnetic dipole: a closed circulation of electric current. A simple example is
a single loop of wire with electric current flowing through it.
• Domains: ferromagnetic material is divided into tiny regions
• Curie temperature: The point at which there is no magnetization
anymore in the exact and different temperature depends on element
15. • Ferromagnets are materials that have some magnetization on
their own.
This means that at a temperature of absolute zero and without any
magnetic field from other objects, they are still magnetic. The reason
for this is that the electrons in a material have aspin.
In ferromagnetic materials, the electrons like to have all the
spins going one way, giving some magnetism.
Usually, as the temperature is increased, the magnetization goes down.
This is because the temperature causes the electrons in the material to
move around a bit more. They do not have the spins perfectly going in
the same way anymore. The point at which there is no magnetization
anymore is called the Curie temperature. This changes with different
materials. It changes ferromagnetism to paramagnetism
