Why in the News?
Researchers at S N Bose National Centre for Basic Sciences (SNBNCBS) have discovered a novel transport behaviour in chromium antimonide (CrSb), a member of the emerging class of magnetic materials called altermagnets.
What are Altermagnets?
- Definition: Altermagnets are a new class of magnetic materials that combine properties of ferromagnets (which show external magnetism) and antiferromagnets (which don’t).
- Unique Feature: They don’t attract metals like fridge magnets but still have active internal magnetic behavior, useful in advanced technology.
- Use in Spintronics: These materials are ideal for spintronics, a technology that uses electron spin (not just charge) to make faster and energy-efficient devices.
- No Magnetic Interference: Altermagnets do not create external magnetic fields, so they are stable and safe for nearby electronics.
- Energy Efficient: Their structure helps reduce heat and energy loss, which is perfect for modern low-power gadgets.
- Scientific Rarity: Very few altermagnets are known, making each discovery important for materials science.
- Potential Applications: They could help build smaller memory chips, faster processors, and even support quantum computing.
- Internal Action: Think of them as “quiet magnets” — they work inside devices without magnetic noise.
Recent Discovery- Chromium Antimonide (CrSb):
- Indian Breakthrough: Indian scientists found CrSb, a new altermagnet, showing rare direction-dependent conduction.
- Directional Behavior: CrSb acts as an n-type material when current flows along its layers, and as a p-type when current flows across them.
- First of its Kind: This is the first time an altermagnet has shown such dual conduction behavior in different directions.
- Device Simplification: Since CrSb can behave as both p-type and n-type, it can reduce circuit size and eliminate the need for doping.
- Eco-friendly Material: CrSb is made from non-toxic, common elements, making it ideal for sustainable electronics.
- Potential Applications:
- Future Potential: CrSb could be used in solar cells, batteries, and processors to make them greener and more efficient.
- Environment-Friendly Tech: CrSb enables low-cost and eco-friendly electronics without sacrificing performance.
| [UPSC 2021] Magnetite particles, suspected to cause neurodegenerative problems, are generated as environmental pollutants from which of the following? 1. Brakes of motor vehicles 2. Engines of motor vehicles 3. Microwave stoves within homes 4. Power plants 5. Telephone lines Select the correct answer using the code given below.
Options: (a) 1, 2, 3 and 5 only (b) 1, 2 and 4 only* (c) 3, 4 and 5 only (d) 1, 2, 3, 4 and 5 |
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