A permanent magnet having a high glass forming iron-base alloy

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PROBLEM TO BE SOLVED : To provide an Fe-based permanent magnet alloy combining high glass forming capacity, excellent workability and high hard magnetic properties. SOLUTION : The alloy is a metallic glass alloy which has a composition containing Fe as a principal component and also containing one or more elements selected from among rare earth elements(RE), one or more elements selected from among V, Ti, Cr, Mn, Co, Cu, Nb, Mo, W, Ta, Hf and Zr as transition metals(TM), and boron (B) and in which the temperature spacing ΔTx in supercooled liquid zone represented by equation ΔTx=Tx-Tg (where Tx and Tg mean initial crystallization temperature and glass transition temperature, respectively) is >=35 deg.C. A sheet metal material having =90% volume ratio of amorphous phase can be obtained by a single roller liquid quenching method. After heat treatment, magnetic properties of >=1.00 T residual magnetic flux density (Br), >=150 kA/m coercive force (iHc) and >=60 kJ/m3 maximum energy product (BH)max can be obtained.