🗓️ Posted on: 30 June 2025 | Source: PIB Delhi
🔍 What’s the News?
Researchers at S. N. Bose National Centre for Basic Sciences (DST) have discovered a rare dual conduction property in a newly studied magnetic material called CrSb (Chromium Antimonide) — an altermagnet. This could revolutionize next-gen electronics by simplifying device architecture and enabling new technologies like spintronics.
🧲 What Are Altermagnets?
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A new class of magnetic materials.
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Combine best features of:
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Ferromagnets (like fridge magnets) — magnetic externally.
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Antiferromagnets — internally magnetic but net zero externally.
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Altermagnets have no external magnetism but internally exhibit unique electron spin behavior → Useful in spintronics.
💡 What Makes CrSb Special?
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Extreme thermal endurance: Works at >2× room temperature.
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Massive spin splitting: >30× room temperature.
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Metallic nature + Altermagnetic = Dual advantage.
⚡ New Phenomenon Discovered: DDCP (Direction Dependent Conduction Polarity)
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In CrSb, conduction changes based on direction of current:
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🔹 Within crystal layers → Electrons carry current → n-type behavior.
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🔸 Across layers → Holes carry current → p-type behavior.
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📌 This dual behavior in a single material is:
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Extremely rare.
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First time seen in an altermagnet.
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Could replace complex heterostructures in electronics.
🔧 Why This Matters for Tech?
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Devices (solar cells, thermoelectrics, sensors) need both p-type & n-type materials.
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Traditionally done via mixing or doping.
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CrSb can do both natively, making devices:
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Smaller
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More efficient
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Easier to manufacture
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🌱 Eco Advantage
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Made from earth-abundant and non-toxic elements.
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Environmentally friendly — suitable for green electronics.
🔬 Applications & Future Impact
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Spintronics (electron spin-based devices)
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Thermoelectrics
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Compact multifunctional electronics
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Reduced reliance on foreign-element doping or complex layering
📚 UPSC Angle (GS3: Sci-Tech + Environment)
| Area | Relevance |
|---|---|
| Science & Tech | Spintronics, material innovation, nanoelectronics |
| Environment | Use of non-toxic, earth-abundant materials |
| Economy | Indigenous innovation in electronics manufacturing |
| Current Affairs | Breakthroughs in Indian research institutions (S.N. Bose Centre) |
🧠 Prelims Pointers
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CrSb = Chromium Antimonide
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Altermagnet = Magnetic class with zero net magnetism but unique spin
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DDCP = Direction Dependent Conduction Polarity
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First altermagnet showing dual n-type/p-type conduction
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Research institute: S.N. Bose National Centre for Basic Sciences