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Guide

Path to Product: Sustainable Permanent Magnet Supply Chains

Path to Product: Sustainable Permanent Magnet Supply Chains

A decision-maker's guide to the sustainability of NdFeB permanent magnets, the rare-earth-based magnets powering EV motors, wind turbines and robotics. The materials, the carbon-intensive manufacturing, the recycling gap, and how to prepare for the EU Critical Raw Materials Act, all through the lens of LCA.

A decision-maker's guide to the sustainability of NdFeB permanent magnets, the rare-earth-based magnets powering EV motors, wind turbines and robotics. The materials, the carbon-intensive manufacturing, the recycling gap, and how to prepare for the EU Critical Raw Materials Act, all through the lens of LCA.

Robert Pell

Robert Pell

IN SUMMARY

Navigating the sustainable permanent magnet supply chain

Navigating the sustainable permanent magnet supply chain

Neodymium-iron-boron (NdFeB) permanent magnets are crucial to the energy transition, powering high-performance motors, direct-drive wind turbines, robotics and a wide range of clean energy technologies. But their efficiency comes with a complex web of critical materials, carbon-intensive manufacturing, and a near-total reliance on rare earth elements sourced overwhelmingly from China. With demand accelerating and recycling rates extremely low, the supply chain faces real sustainability and resilience challenges. This guide, part of Minviro's "Path to Product" series, walks through the materials behind permanent magnets, how they are made, the levers for cutting impact, the circular opportunities, and what emerging regulation like the EU Critical Raw Materials Act will require, all through the lens of life cycle assessment.

  • Rare earths make magnets work, and concentrate the risk. NdFeB magnets depend on neodymium and praseodymium, with dysprosium and terbium for high-temperature performance, and as of 2024 China accounts for around 69% of rare earth mining and more than 90% of global refining capacity.

  • Manufacturing is carbon-intensive. From mining through high-temperature sintering (1000–1100°C), magnet production is energy-heavy, and because most output is in China on a coal-dominated grid, emissions are significant.

  • Recycling is almost non-existent. Less than 5% of NdFeB magnets are recycled, with end-of-life recovery of rare earths under 1% of demand, so virgin extraction remains the main supply route even as demand surges.

The materials behind permanent magnets

NdFeB remains the market-leading magnet chemistry thanks to its exceptional magnetic energy density, and understanding its constituent materials is key to understanding its footprint. Neodymium is the principal rare earth, sourced mainly from carbonatite deposits like Bayan Obo in China, delivering strong magnetic fields but linked to environmental degradation during mining and acid-intensive processing. Praseodymium is commonly alloyed with it as NdPr oxide, often co-produced to reduce extra mining burden. Dysprosium and terbium let magnets perform at higher temperatures, critical for automotive and wind applications, but come largely from ionic clay deposits under often unsafe, ecologically harmful conditions. Iron and boron form the structural foundation, with iron needing high-temperature sintering. Two alternative chemistries exist: samarium-cobalt (SmCo), stable at extreme temperatures and used in aerospace and defence, but expensive and cobalt-dependent; and ferrites (ceramic magnets), low-cost and common in consumer electronics but far weaker than rare earth magnets.

How permanent magnets are made

Magnet production runs through five stages. Raw material preparation mines rare earth ores from carbonatites, monazites or ionic clays, then beneficiates them by flotation or leaching into REE-rich concentrates. Separation and refining uses solvent extraction to chemically separate the concentrate into neodymium, praseodymium, dysprosium and terbium oxides, followed by energy-intensive acid or alkali purification. Metal and alloy production reduces those oxides to metals via electrolysis or calcium reduction, melts them with iron and boron to form the magnet alloy, and strip-casts and crushes it into coarse powder. Powder-to-magnet then jet-mills the flakes into fine powder, aligns the powder in a magnetic field to set the magnetic direction, and sinters and heat-treats the compacted powder for strength. Finally, finishing and integration machines the magnets to shape, coats them against corrosion, magnetises them with a strong external field, and assembles them into motors, turbines or devices. Mining through sintering are the most carbon-intensive stages.

Cutting impact and closing the loop

Several levers can substantially reduce a magnet's footprint. On energy: rare earth separation and alloying are energy-intensive, so switching from fossil grids to renewables like hydro or wind can cut emissions by 30–60%, with design improvements like grain boundary diffusion and Halbach arrays boosting efficiency while reducing dysprosium use. On materials: substituting ferrites or SmCo in less demanding applications reduces critical REE dependency, and smarter magnet configurations improve performance per unit of material. On circularity: this is the biggest gap and opportunity, since global recovery of rare earths from end-of-life magnets is under 1% of demand. Techniques like hydrogen decrepitation, spark plasma sintering, hydrometallurgy and bioleaching are making recovery from hard drives, motors and turbines increasingly viable, and direct recycling can retain magnetic properties without reverting to raw elements. Designing for disassembly and product-as-a-service models support take-back and reuse. Combining green energy, smarter processing and material efficiency across the NdFeB supply chain can cut life cycle impacts by over 50%.

Several levers can substantially reduce a magnet's footprint. On energy: rare earth separation and alloying are energy-intensive, so switching from fossil grids to renewables like hydro or wind can cut emissions by 30–60%, with design improvements like grain boundary diffusion and Halbach arrays boosting efficiency while reducing dysprosium use. On materials: substituting ferrites or SmCo in less demanding applications reduces critical REE dependency, and smarter magnet configurations improve performance per unit of material. On circularity: this is the biggest gap and opportunity, since global recovery of rare earths from end-of-life magnets is under 1% of demand. Techniques like hydrogen decrepitation, spark plasma sintering, hydrometallurgy and bioleaching are making recovery from hard drives, motors and turbines increasingly viable, and direct recycling can retain magnetic properties without reverting to raw elements. Designing for disassembly and product-as-a-service models support take-back and reuse. Combining green energy, smarter processing and material efficiency across the NdFeB supply chain can cut life cycle impacts by over 50%.

Geography, regulation and the MineMT project

Magnet supply chains are extraordinarily concentrated: as of 2024 China accounts for around 69% of rare earth mining output and controls more than 90% of refining, with the US (around 12%, mainly Mountain Pass), Myanmar (around 8%) and Australia (around 6%, via Lynas) making up most of the rest. That concentration is expected to ease slightly toward 2030 as Australia, Myanmar, the US, Vietnam, India and Brazil build capacity. Regulation is tightening in response: the EU Critical Raw Materials Act and Extended Producer Responsibility rules will require OEMs to trace, report and recycle critical materials like neodymium, dysprosium and terbium, while the Digital Product Passport will require magnets in motors, turbines and electronics to disclose origin, embedded carbon and end-of-life options. Magnets are not yet covered by CBAM, but their high upstream emissions suggest possible future inclusion. This is the backdrop to Minviro's MineMT project, an 18-month Innovate UK-backed collaboration with the University of Exeter and Mkango Resources that used XYCLE to pilot an integrated Life Cycle Sustainability Assessment, combining environmental, social, economic, circularity and criticality data into a single dashboard for the first time in the rare earths sector.

Magnet supply chains are extraordinarily concentrated: as of 2024 China accounts for around 69% of rare earth mining output and controls more than 90% of refining, with the US (around 12%, mainly Mountain Pass), Myanmar (around 8%) and Australia (around 6%, via Lynas) making up most of the rest. That concentration is expected to ease slightly toward 2030 as Australia, Myanmar, the US, Vietnam, India and Brazil build capacity. Regulation is tightening in response: the EU Critical Raw Materials Act and Extended Producer Responsibility rules will require OEMs to trace, report and recycle critical materials like neodymium, dysprosium and terbium, while the Digital Product Passport will require magnets in motors, turbines and electronics to disclose origin, embedded carbon and end-of-life options. Magnets are not yet covered by CBAM, but their high upstream emissions suggest possible future inclusion. This is the backdrop to Minviro's MineMT project, an 18-month Innovate UK-backed collaboration with the University of Exeter and Mkango Resources that used XYCLE to pilot an integrated Life Cycle Sustainability Assessment, combining environmental, social, economic, circularity and criticality data into a single dashboard for the first time in the rare earths sector.

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Robert Pell

Robert Pell

Founder & CEO

Robert Pell is the Founder and CEO of Minviro. His doctoral research at the University of Exeter's Camborne School of Mines focused on responsible sourcing of rare earth elements, pioneering novel Life Cycle Assessment approaches and developing methodology for integrating LCA into mine planning. A published scientist and experienced speaker, Robert holds roles as Chair of the Rare Earth Industry Association (REIA) and the Critical Minerals Association (CMA).

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Robert Pell

Robert Pell

Founder & CEO

Robert Pell is the Founder and CEO of Minviro. His doctoral research at the University of Exeter's Camborne School of Mines focused on responsible sourcing of rare earth elements, pioneering novel Life Cycle Assessment approaches and developing methodology for integrating LCA into mine planning. A published scientist and experienced speaker, Robert holds roles as Chair of the Rare Earth Industry Association (REIA) and the Critical Minerals Association (CMA).

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The foundation for
all our work

The foundation for all our work

Our data focuses on materials and processes where environmental performance varies sharply by route, geography, and technology, exactly where industry averages fall apart. Choose individual routes from across the critical minerals, battery, magnet, and heavy-industry value chains. Each one lands in XYCLE as a working model: open the unit processes, see where the impact sits, test a different supplier or energy grid, and watch the number move, defensible enough for a regulatory filing, transparent enough to act on.

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