MAGNETIC PROPERTIES - CONCEPTS Flashcards
Direction of magnetic dipole moment
South to north
What causes the generation of magnetic forces?
Movement of electrically charged particles
What part of the atom is the source of magnetic properties?
Electrons
What are the two types of electron motion?
(1) Electron spins about its axis and (2) Electron orbits around the nucleus
It is the most fundamental magnetic moment
Bohr magneton
The directions of spin magnetic moment
Up or down
The magnitude of an electron’s orbital magnetic moment is equal to…
Product of Bohr magneton value and electron’s magnetic quantum number
It refers to the “plus or minus the value of the Bohr magneton”
Electron spin magnetic moment
It is the sum of the contribuots of each magnetic moment for each electron of an atom
Net magnetic moment
Cancellation of net magnetic moment occurs when…
The electron pairs cancel each other’s spin and orbital moment. This cancellation results in lack of magnetic moment.
The total/net magnetic moment is simply the sum of..
Orbital moment and spin moment
Applied magnetic field is generated when…
A current passes through a coil
When more change is put into more motion, the magnetic field (increases/decreases/remain the same).
Increases
Refers to an externally applied magnetic field
Magnetic field strength (H)
It is the ability of a material to support the formation of a magnetic field within itself
Magnetic permeability
It represents the magnitrude of the internal field strength within a substance subjected to magnetic field strength (H)
Magnetic flux density
It indicates whether a material is attracted or repelled out of a magnetic field
Magnetic susceptibility
[Dia-/Para-/Ferro-/Antiferro-/Ferrimagnetic] These substances have ZERO net magnetic moment due to same no. of electrons of opposing spin.
Diamagnetic substances
[Dia-/Para-/Ferro-/Antiferro-/Ferrimagnetic] These substances have H=0.
Diamagnetic substances
[Dia-/Para-/Ferro-/Antiferro-/Ferrimagnetic] These substances have magnetic dipoles with each atom.
Paramagnetic substances
Are paramagnetic substances considered magnetic?
No, since their dipoles are randomly oriented
Diamagnetics have (negative/positive) magnetic susceptibility, xm.
Negative magnetic susceptibility
Paramagnetics have (negative/positive) magnetic susceptibility, xm.
Positive magnetic susceptibility
Aluminum oxide, copper, and gold are — substances.
Diamagnetic substances
Aluminum, chromium, and magnese sulfate are — substances.
Paramagnetic substances
[Dia-/Para-/Ferro-/Antiferro-/Ferrimagnetic] These substances have magnetic moments associated with each atom.
Ferromagnetic substances
[Dia-/Para-/Ferro-/Antiferro-/Ferrimagnetic] These substances have their magnetic moment coupling be in an antiparallel alignment.
Antiferromagnetic substances
[Dia-/Para-/Ferro-/Antiferro-/Ferrimagnetic] These substances have NO NET magnetic moment due to the parallel and anti-parellel pairs of their magnetic moments.
Antiferromagnetic substances
Manganese oxide, manganese sulfide, and iron oxide are — substances.
Antiferromagnetic substances
Magnetite and pyrrhotite are — substances.
Ferrimagnetic substances
Magnetic dipole moments become free to rotate and randomize in direction above…
The Curie temperature
Ferro and ferrimagnets become paramagnetic when…
The magnetic dipole moments exceed the Curie temperature
Antiferromagnets become paramagnetic when…
The temperature exceed the Neel point
