---
title: "Ferrimagnetic versus antiferromagnetic materials"
subject: "Electrical Engineering Material"
chapter: 4
key: "semester_3/electrical_engineering_material:ferri-vs-antiferromagnetic"
source: https://www.bctengineer.com/q/semester_3/electrical_engineering_material/ferri-vs-antiferromagnetic
site: BCT Engineering
---

# Ferrimagnetic versus antiferromagnetic materials

Electrical Engineering Material · Chapter 4: Magnetic Materials

- Asked in: 2069 Chaitra, 4 marks
- Video: [Antiferromagnetic and Ferrimagnetic Materials](https://www.youtube.com/watch?v=zugNDYfJ_rc) — Dr. L. Sangeetha
- Answer checked by Claude Opus 5.5 (high effort) on 2026-10-14
- Page: https://www.bctengineer.com/q/semester_3/electrical_engineering_material/ferri-vs-antiferromagnetic
- Whole chapter: https://www.bctengineer.com/md/semester_3/electrical_engineering_material/chapter-4

## Question

What are ferri magnetic materials? Explain how does its property differ with anti-ferromagnetic material?

## Short answer

Ferrimagnetic materials have antiparallel but unequal sublattice moments, giving net spontaneous magnetization and hysteresis. Antiferromagnetic materials have equal antiparallel moments, cancelling completely, with no net magnetization or hysteresis.

## Answer

**Ferrimagnetic materials** are materials whose crystal has two magnetic sublattices with atomic moments aligned **antiparallel but of unequal size**. The moments do not cancel, so a net **spontaneous magnetization** exists. They show domains, hysteresis and saturation like ferromagnets, and are mostly ceramic oxides (ferrites) with very high resistivity. Examples: magnetite Fe₃O₄, MnZn and NiZn ferrites, YIG.

```text
 Ferrimagnetic:     ^  v  ^  v   (long ^, short v)
 Antiferromagnetic: ^  v  ^  v   (equal lengths)
```

#### Difference from antiferromagnetic materials
| Point | Ferrimagnetic | Antiferromagnetic |
|---|---|---|
| Sublattice moments | Antiparallel, unequal | Antiparallel, equal |
| Net magnetization | Non-zero (spontaneous) | Zero |
| Susceptibility | Large ($10$–$10^4$) | Small, positive |
| Domains and hysteresis | Present | Absent |
| Critical temperature | Curie (Néel) temperature; above it paramagnetic | Néel temperature $T_N$; $\chi$ maximum at $T_N$ |
| Below critical temp. | Spontaneous magnetization, which falls as $T$ rises towards $T_C$ | No net magnetization; small $\chi$ that increases with $T$ |
| Practical use | HF transformer cores, inductors, microwave devices | Few direct uses (spin valves, research) |
| Examples | Fe₃O₄, ferrites | MnO, FeO, NiO, Cr |

## Check yourself

The answer's key points as multiple-choice questions, with the correct option and why.

1. What defines a ferrimagnetic material?
   A. Two sublattices with antiparallel but unequal moments, giving net spontaneous magnetization
   B. Equal antiparallel moments
   C. All moments parallel in one lattice
   D. No permanent moments
   Answer: A. Unequal moments do not cancel. (Key point: Ferrimagnet definition)

2. Net magnetization of ferri vs antiferro:
   A. Ferri: zero; antiferro: non-zero
   B. Ferri: non-zero; antiferro: zero
   C. Both zero
   D. Both large
   Answer: B. Antiferro sublattices are equal. (Key point: Net M)

3. Which show domains and hysteresis?
   A. Antiferro only
   B. Neither
   C. Ferrimagnetic, not antiferromagnetic
   D. Both
   Answer: C. Spontaneous magnetization is needed for domains. (Key point: Domains)

4. Practical use:
   A. Ferri: none; antiferro: HF transformers
   B. Both: power cores
   C. Antiferro: permanent magnets
   D. Ferri: HF cores and microwave devices; antiferro: few direct uses
   Answer: D. Ferrites are widely used at high frequency. (Key point: Uses)

## Related in Electrical Engineering Material

- [Ferrimagnetic versus ferromagnetic materials](https://www.bctengineer.com/question.md?key=semester_3%2Felectrical_engineering_material%3Aferri-vs-ferromagnetic) — Electrical Engineering Material, chapter 4
- [Ferromagnetic versus antiferromagnetic materials](https://www.bctengineer.com/question.md?key=semester_3%2Felectrical_engineering_material%3Aferro-vs-antiferromagnetic) — Electrical Engineering Material, chapter 4
- [Magnetic moments; ferro vs ferrimagnetic materials](https://www.bctengineer.com/question.md?key=semester_3%2Felectrical_engineering_material%3Adipole-moment-ferro-ferri) — Electrical Engineering Material, chapter 4
- [Classification by susceptibility; ferro vs ferrimagnetic](https://www.bctengineer.com/question.md?key=semester_3%2Felectrical_engineering_material%3Aclassify-susceptibility-ferro-ferri) — Electrical Engineering Material, chapter 4
- [Ferro vs antiferromagnetic; magnetostriction](https://www.bctengineer.com/question.md?key=semester_3%2Felectrical_engineering_material%3Aantiferro-magnetostriction) — Electrical Engineering Material, chapter 4
- [Applications of soft magnetic materials](https://www.bctengineer.com/question.md?key=semester_3%2Felectrical_engineering_material%3Asoft-magnetic-applications) — Electrical Engineering Material, chapter 4, asked 2×

## Related in other subjects

- [Soft versus hard magnetic materials](https://www.bctengineer.com/question.md?key=semester_5%2Felectric_machine_design%3Asoft-hard-magnetic-materials) — Electric Machine Design, chapter 1, asked 5×
- [Why CRGO is a superior magnetic material](https://www.bctengineer.com/question.md?key=semester_5%2Felectric_machine_design%3Acrgo-superior-material) — Electric Machine Design, chapter 1
- [Soft magnetic material, Faraday's laws](https://www.bctengineer.com/question.md?key=semester_4%2Felectrical_machines%3Asoft-magnetic-faraday-laws) — Electrical Machines, chapter 1
- [Soft magnetic materials and commercial applications](https://www.bctengineer.com/question.md?key=semester_5%2Felectric_machine_design%3Asoft-magnetic-applications) — Electric Machine Design, chapter 1, asked 2×