the present invention as shown in fig1 is basically constructed by a support 1 and a magnetic recording layer 3 comosed of column shaped clusters of ferromagnetic particles 2 provided on the support suitable materials which can be used for the non magnetic support in the present invention include plastics such as polyethylene terephthalate polyimide polyamide polyvinyl chloride cellulose triacetate polycarbonate polyethylene naphthalate etc also non magnetic metals such as al cu sus etc and inorganic substances such as glass ceramics etc may be used as the non magnetic support of these polyethylene terephthalate is preferably used for the support the thickness of support is preferably 4 to 30 u03bcm these supports may be provided with a layer containing inorganic particles and a binder on its surface opposite the surface on which a ferromagnetic metal thin film is to be formed suitable examples of the inorganic particles include calcium carbonate carbon black particles and so on and preferable examples of the binder include nitrocellulose polyurethane isocyanate polyester and mixtures thereof on the occasion that the support is a plastic film it is to be desired that the film should have a surface roughness ra of 0 012 u03bcm or less a ferromagnetic metal thin film made up of clusters of ferromagnetic particles having a column structure has a high coercive force and the column structure can easily be formed by an inclined evaporation technique as described in u s pat no 3 342 632 therefore it is desirable that the ferromagnetic metal thin film of the present invention has an oblique column structure the oblique column structure can be formed by for example depositing co or an alloy containing co at an angle.