Magnetic Properties (Concepts) Flashcards
“movers and shakers” of modern technology
Magnets
- Magnets have a north and a south pole
- The direction of moment is from south to north
Magnetic Dipole
____________ never cross. They don’t start or stop anywhere; they always make closed loops and will continue inside a magnetic material (though sometimes they are not drawn this way).
Magnetic field lines
magnetic forces are generated by moving ________ charged particles
electrically
Which part of the atom is the source of magnetic properties?
ELECTRONS
most fundamental magnetic moment is the _____________
BOHR MAGNETON
Two Types of Electron Motion
- Spin Magnetic Moment
- Orbital Magnetic Moment
As _____ charge is put in more motion, the strength of a magnetic field increases.
more
The externally applied magnetic field, sometimes called the _______, is designated by H
magnetic field strength
represents the magnitude of the internal field strength within a substance subjected to H
Magnetic Flux Density
the ability of a material to support the formation of a magnetic field within itself
Magnetic Permeability
when a magnetic material is placed near a magnet… the magnetic moment align and reinforce the existing field
Magnetization of Solid
indicates whether a material is attracted or repelled out of a magnetic field
Magnetic Susceptibility
5 Types of Magnetism
- Diamagnetism
- Paramagnetism
- Ferromagnetism
- Antiferromagnetism
- Ferrimagnetism
substances have zero net magnetic moment because they have the same number of electrons of opposing spin
Diamagnetism
a _______ substance has a magnetic dipoles associated with each atom
paramagnetic
- has magnetic moments associated with each atom
- highly magnetic since moments are aligned
even in the absence of a magnetic field
ferromagnetism
- has magnetic moments which are coupled
- moments are aligned but has parallel and antiparallel pairs
antiferromagnetism
- has magnetic strength similar to ferromagnets
- highly magnetic since moments are not totally cancelled
Ferrimagnetism
The atomic magnetic moments are free to rotate; hence, with (1) ________ temperature, the (2) ________ thermal motion of the atoms tends to (3) ________ the directions of any moments that may be aligned.
(1) rising
(2) increased
(3) randomize
Above the Curie temperature, the moments are free to (1) ________ and (2) _______ the direction (ferro- & ferrimagnets become paramagnetic)
(1) rotate
(2) randomize
Antiferromagnetic materials behave ________ at temperatures above the Neel Point
paramagnetically
