Abstract
Spontaneous and magnetic field induced incommensurate – commensurate magnetic phase transitions have been studied in Tb1-xErxNi5 compounds near the critical concentration xc = 0.125. Compounds crystallize in the hexagonal CaCu5 type phase (P6/mmm space group). In compounds with x ≥ xc the magnetic order is a commensurate ferromagnetic one. The samples with x < xc have an incommensurate structure that is a fan like magnetic structure and described by two propagation vectors. An incommensurate – “lock in” magnetic transition takes place at 10 K at cooling regime.
Highlights
Magnetostriction is a phenomenon when ferromagnetic materials change their shape or/and dimensions during magnetization in applied magnetic field
Magnetostriction of ferrogels based on physical and chemical networking with embedded strontium hexaferrite particles was studied in 420 mT uniform magnetic field
A spherical sample FGI with approximate diameter of 3 mm was pinned by a needle mounted vertically downside at the cap of the optical cuvette Several droplets of water were put in the cuvette to provide saturated water vapor inside and to prevent weight loss of the ferrogel due to evaporation
Summary
Magnetostriction is a phenomenon when ferromagnetic materials change their shape or/and dimensions during magnetization in applied magnetic field. The elongation of a magnetic composite along the field lines (positive magnetostriction) was experimentally confirmed in several reports [4,5,6,7]. It is important, to point out that the mentioned theoretical result refers to magnetostriction of i) noncompressible ii) uniformly magnetized composite. To point out that the mentioned theoretical result refers to magnetostriction of i) noncompressible ii) uniformly magnetized composite If one of these two conditions fails, there
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