Magnetic order in graphite: Experimental evidence, intrinsic and extrinsic difficulties

We discuss recently obtained data using different experimental methods including magnetoresistance measurements that indicate the existence of metal-free high-temperature magnetic order in graphite. Intrinsic as well as extrinsic difficulties to trigger magnetic order by irradiation of graphite are discussed in view of recently published theoretical work. (C) 2009 Elsevier B.V. All rights reserved.