Iron

Nanoparticle Magnets Conserve Rare Earth Metals

Nanoparticle Magnet

Professor George Hadjipanayis. Source: University of Delaware.

Researchers at the University of Delaware and at General Electric Global Research are independently developing new magnets using nanoparticles to preserve the increasingly small supply of rare earth metals typically used in the strongest magnets made today. These new magnets are also stronger and lighter than traditional magnets and should increase efficiency as well as conserve the dwindling supply of neodymium, dysprosium, and terbium.

Demand for these metals is quickly outstripping their availability. This may be exacerbated by stricter export policies from China where most of the current supply is found. The Department of Energy has funded two independent projects looking to circumvent this scarcity by using nanoparticles to create magnets instead of large quantities of metals. Both projects are taking the same general approach to the problem - creating magnets from nanoparticles combining very small amounts of these rare metals with particles of iron and other more common metals. The small scale structure of these compounds greatly increases the magnetism found in the metal alone, requiring much less metal to achieve the same - or better - results found in normal magnets.

GE is being fairly tight lipped about the specific composites in its magnets and about their manufacturing process. They claim to have successfully produced thin films of magnets using their process and are working on making magnets large enough for practical use. The other research group - headed by the Chairman of the Physics Department George Hadjipanayis at the University of Delaware - is more open about its methods but is also having difficulty scaling their process up sufficiently for practical use.

The team at Delaware is using a combination of iron and cobalt with the standard rare metals in particles of around 20-30 nanometers to create its nanomagnetic material. They are trying to increase the magnetism of these particles and discover ways to assemble them into functional two and three dimensional arrays that act like traditional magnets. Their current research has general applications, but specific projects are focused on creating viable storage media and magnets for various types of medical research and technology.

TFOT has previously reported on other research into magnets and using magnets including superconductivity research at the Los Alamos National Laboratory Magnet Lab and magnetic spaceshields that could protect spaceships from high speed particles and solar flares. TFOT has also reported on other nanoparticle research including a nanoparticle vaccine for Type 1 diabetes, silver nanoparticles for creating small electronics, and a way to encapsulate cancer treatments in nanoparticles.

Read more about the University of Delaware research into magnetic nanoparticles on the group website. Read more about the initial DOE grant funding this research in this University of Delaware

July 26, 2011 - Janice Karin
www.thefutureofthings.com

US Rare Earth Public Policy Needs to Move From Studies to Actions

One of my favorite consulting slogans of all time “Analysis Paralysis”€” aptly captures the state of US public policy on rare earth metals and critical minerals (not to confuse the two). After our story last week on testimony presented to the House Committee on Natural Resources, urging the Committee to take action on a number of bills involving rare earth metals, we heard from Jeff Green, a well-known rare earth and specialty metals lobbyist. Green wanted to share some of his perceptions of current legislation and where he thinks US public policy needs to go to begin addressing some of the strategic supply constraints.

Rare Earth Stockpiling

“€œA lot of people are misperceiving what is being debated related to a stockpile”,€ Green said. “€œThe only proposal on the table involves a new version of the RESTART Act (Rare Earths Supply Chain Technology and Resources Transformation (RESTART) Act of 2011) that calls for a 250-ton inventory of rare earth alloy and rare earth magnets.”€ The concept involves creating a small vendor-managed inventory that could be drawn down in a time of war. The “stockpile” would involve the government essentially buying up capacity from one of the US mining firms, as opposed to actually taking title and inventory. This approach, according to Green, provides critical domestic demand, a key component of re-starting US industry.

An Incremental Approach€“ the RESTART Act

Another approach, one that Green favors, was offered by Rep. Mike Coffman (R-Co.) as an amendment to the Fiscal Year 2012 National Defense Authorization Act. It requires the DOD to create a Rare Earth Inventory Plan that would explore risk mitigation for those individual elements expected to be in short supply like neodymium and dysprosium.

This plan would be a follow-up to another congressionally mandated report, due to come out this summer, that essentially includes a supply and demand analysis by element for DOD. The Coffman amendment to the FY12 NDAA would require the Defense National Stockpile Center (now renamed Defense Logistics Agency Strategic Materials) to look at the elements in shorter supply and identify how the government plans on securing those elements and downstream value-added products such as metal, alloy and magnets. The amendment would only cover defense applications (not commercial), though the executive branch could take it further, should it so choose, according to Green.

Rather than try broad-brush solutions, Green suggests approving smaller incremental approaches that actually offer solutions. For example, he suggests passage of an initial bill that covers specific rare earth metals as opposed to all or other critical materials such as copper and cobalt that could quickly spin legislative action out of control.

Neodymium, Samarium, Dysprosium, Yttrium, Terbium: Good Places to Start

The “€œheavies”,€ as they are commonly referred to, present a different challenge as the US currently does not produce any of these elements.

Moreover, according to the U.S. Magnetic Materials Association (USMMA), the following defense applications remain dependent upon rare earth materials. In particular, precision-guided munitions (requiring samarium-cobalt or neodymium iron boron permanent magnets), neodymium iron boron magnets used in helicopter stealth technology, tanks and other vehicles use rare earth lasers for range finding, military communication satellites and yttria-stabilized zirconia used in “€œhot”€ sections of jet engines, according to the USMMA.

The USMMA supports legislation that “€œemphasizes production”€ to restart reliable domestic manufacturing for these key materials as well as defense-specific stockpiling for the most critical of the 17 rare earth elements via the Defense Logistics Agency.

At the end of the day, according to Green, US public policy should focus on only two initiatives:

  • Define what we are short of
  • Determine how we get it

It’€™s hard to argue with that. But with some estimates of the time needed to rebuild a rare-earth supply chain of 15 years, and a minimum of two years to create magnet facilities for sintered neodymium iron boron permanent magnets, Congress had better start acting soon.

June 7, 2011 By Lisa Reiman