Magnetism
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This is a sensitive magnetometer which is based on superconducting loops containing Josephson junctions and is used to measure extremely subtle magnetic fields.
SQUID superconducting quantum interference device
Gyromagnetic ratio for a transition metal with more than a half filled d-orbital shell
g>2
Gyromagnetic ratio for a transition metal with less than a half filled d-orbital shell
g<2
Gyromagnetic ratio for a free electron
2.0032
μeff = g*(J*(J+1))1/2
Magnetic moment for systems where Russell-Sauders does apply
What are the possible values of Stot for the system below if the two iron centers are magnetically couple?
Stot ranges from 0 to 5 |5/2-5/2| —-> |5/2+5/2|
What is the total spin of the system below if the two iron centers are antiferromagnetically coupled?
Stot=0 5/2-5/2=0
Are individual molecules that function as single-domain nanoscale magnetic particles below their blocking temperature.
Single-Molecule Magnets • large ground-state spin (S) • negative magnetoanisotropy (negative zero-field splitting, D)
A type of a magnetic exchange that may arise between ions in different oxidation states where two electrons are transferred simultaneously between the two metal centers and a bridge anion.
Double exchange Simultaneous hop of an electron from Mn3+ to an O 2p and from the O 2p to an Mn4+ takes place
Is the antiferromagnetic coupling between two next-to-nearest neighbour cations through a non-magnetic anion.
Antiferromagnetic Superexchange The magnetic moment decreases and becomes less than even the normal paramagnetic substance.
The phenomenon in which the value of a physical property has a history dependence of physical system.
Hysteresis
A measure of a material magnetization when a magnetic field is applied.
Susceptibility (χ)
μeff = g*(S*(S+1))1/2 For systems where Russell-Sauders does not apply
The spin-only magnetic moment
Antiparallel magnetic alignment of neighboring atoms electrons
Antiferromagnetic
Residual magnetism resulting from both ferromagnetic and antiferromagnetic coupling. These alignments do not cancel out and there is a net magnetic moment.
Ferrimagnetic
Parallel magnetic alignment of neighboring atoms. This cooperative mechanim leads to states of highest spin multiplicity through electron alignment.
Ferromagnetic
Unpaired electrons and magnetic moment is positive.
Paramagnetic
No unpaired electrons. Magnetic moment is zero or slightly negative
Diamagnetic