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Large magnetic anisotropy and coercivity are key properties of functionalmagnetic materials and are generally associated with rare earth elements. Herewe show an extreme, uniaxial magnetic anisotropy and the emergence of magnetichysteresis in Li2(Li1-xFex)N. An extrapolated, magnetic anisotropy field of 220Tesla and a coercivity field of over 11 Tesla at 2 Kelvin outperform all knownhard-ferromagnets and single-molecule magnets (SMMs). Steps in the hysteresisloops and relaxation phenomena in striking similarity to SMMs are particularlypronounced for x << 1 and indicate the presence of nano-scale magnetic centres.Quantum tunnelling, in form of temperature-independent relaxation andcoercivity, deviation from Arrhenius behaviour and blocking of the relaxation,dominates the magnetic properties up to 10 Kelvin. The simple crystalstructure, the availability of large single crystals, and the ability to varythe Fe concentration make Li2(Li1-xFex)N (i) an ideal model system to studymacroscopic quantum effects at elevated temperatures and (ii) a basis for novelfunctional magnetic materials.

Giant magnetic anisotropy and tunnelling of the magnetization in Li2(Li_{1-x}Fe_x)N