Abstract
Two basalt samples with homogeneous titanomagnetites as the only ferrimagnetic component, have been investigated, to find out about the influence of uniaxial compression on coercive force and saturation remanence at different temperatures and on thermoremanent magnetization. The samples have been investigated in natural state and after a heat treatment of 30h at 700°C in air. Caused by this heat treatment the original homogeneous titanomagnetites are transformed into an inhomogeneous mineral aggregate. The natural samples show a strong dependence of all measured values on uniaxial compression: At room temperature and a compression of 1kbar for example, the coercive force increases by about 100% and the saturation remanence decreases by about 50%. These variations are reversible. The behaviour of thermoremanence is distinctly different depending upon whether uniaxial compression and applied magnetic field are parallel or perpendicular to each other. In the first case a decrease of about 50%, in the second case an increase of about 50% is observed.In contrast to these results the heat treated samples show only a very slight dependence of their magnetic parameters on uniaxial compression.
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