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Volume 4 Issue 5, May 2008

Spin-polarized neutrons are sensitive to magnetic fields — a property that Nikolay Kardjilov and colleagues use to visualize the three-dimensional distribution of magnetic fields, by analysing the precession of the neutron's magnetic moment. Pictured is the field surrounding a dipole magnet, as detected by the neutrons. But as neutrons can penetrate through matter relatively easily, the approach can also be used to probe magnetic fields inside massive objects. Letter p399

Cover design by David Shand

Editorial

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Letter

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