Magnetic texture in amorphous Fe40Ni35Si10B15 alloy irradiated with swift heavy ions

The influence of swift-heavy-ion irradiation on the orientation of the hyperfine field in amorphous Fe40Ni35Si10B15 alloy is studied by Mossbauer spectroscopy. The change of the magnetic texture induced by 6 GeV Pb-ion irradiation is studied as a function of ion energy and the linear rate of electronic energy deposition for ion fluences ranging from 1×1011 to 2.4×1013 ions cm-2. The Mossbauer measurements revealed that in a substantial volume fraction of the irradiated samples the spins changed their orientation from the in-plane orientation to the perpendicular one. This effect was attributed to the formation of cylinders of `modified' amorphous structure along the ion path which may induce a stress as a result of which a substantial fraction of spins are aligned along the beam direction, i.e. perpendicular to the plane of the sample.

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