Skip to main content

Ferrimagnetic versus ferromagnetic materials

Short answer

Ferromagnetic materials have all atomic moments parallel, giving large net magnetization. Ferrimagnetic materials have two sublattices with antiparallel but unequal moments, resulting in a smaller net magnetization.

Differentiate between ferrimagnetic and ferromagnetic materials.

Ferromagnetic materials have all atomic moments aligned parallel; ferrimagnetic materials have two sublattices whose moments are antiparallel but unequal, leaving a net moment.

 Ferromagnetic:  ^  ^  ^  ^  ^
 Ferrimagnetic:  ^  v  ^  v  ^   (long ^, short v)
PointFerromagneticFerrimagnetic
Spin arrangementAll parallelAntiparallel, unequal sublattices
Exchange interactionPositive between neighboursNegative between A and B sublattices
Net magnetizationSum of moments (large)Difference of sublattice moments (smaller)
Saturation flux densityHigh (Fe ≈ 2.1 T)Lower (≈ 0.3–0.5 T)
SusceptibilityVery high (10210^2–10510^5)High (1010–10410^4)
Nature of materialMetals and alloysCeramic oxides (ferrites)
Electrical resistivityLow (~10−710^{-7} Ω m)Very high (1–10610^{6} Ω m)
Eddy-current lossHigh, needs laminationsVery low
Frequency rangePower frequency (50 Hz to kHz)kHz to GHz
Mechanical natureDuctile, easy to roll into sheetsHard, brittle, moulded and sintered
Critical temperatureCurie temperature TCT_C (Fe 770 °C)Curie (Néel) temperature, lower (100–600 °C)
ExamplesFe, Co, Ni, Si-steel, permalloyFe₃O₄, MnZn and NiZn ferrites, YIG
UsesPower transformers, motors, generatorsSMPS transformers, RF inductors, antenna rods, microwave isolators

Both show domains, hysteresis, saturation and become paramagnetic above their critical temperature.

✓ Answer checked by Claude Opus 5.5 (high effort)

Related questions

All Electrical Engineering Material chapter 4 questions →