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We report magnetostatic measurements for granulated films(CoFeB)$_{x}$-(SiO$_{2}$)$_{1-x}$ with fabrication induced intraplanaranisotropy. The measurements have been performed in the film plane in the widetemperature interval 4.5$\div$300 K. They demonstrate that above films havelow-temperature anomaly below the percolation threshold for conductivity. Theessence of the above peculiarity is that below 100 K the temperature dependenceof coercive field for magnetization along easy direction deviates strongly fromNeel-Brown law. At temperature lowering, the sharp increase of coercivity isobserved, accompanied by the appearance of coercive field for magnetizationalong hard direction in the film plane. We establish that observed effect isrelated to the properties of individual ferromagnetic granules. The effectweakens as granules merge into conglomerates at $x$ higher then percolationthreshold and disappears completely at $x>1$. We explain the above effect as aconsequence of the difference in thermal expansion coefficients of granule andcover material. At temperature lowering this difference weakens the envelopmentof an individual granule by the cover matrix material, thus permitting torealize the spontaneous magnetostriction of a granule. The latter induces anadditional anisotropy with new easy axis of a granule magnetization along theexternal magnetic field direction. Our explanation is tested and corroboratedby the ferromagnetic resonance measurements in the films at $T$ = 300 K and $T$= 77 K.

Anomalous low-temperature magnetoelastic properties of nanogranular (CoFeB)$_{x}$-(SiO$_{2}$)$_{1-x}$