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In the present paper we study two qubit entanglement in the most general$XYZ$ Heisenberg magnetic chain with (non)homogeneous magnetic fields and theDM anisotropic antisymmetric exchange interaction, arising from the spin-orbitcoupling . The model includes all known results as particular cases, for bothantiferromagnetic and ferromagnetic $XX, XY, XXX, XXZ, XYZ$ chains. Theconcurrence of two qubit thermal entanglement and its dependence on anisotropicparameters, external magnetic field and temperature are studied in details. Wefound that in all cases, inclusion of the DM interaction, which is responsiblefor weak ferromagnetism in mainly antiferromagnetic crystals and spinarrangement in low symmetry magnets, creates (when it does not exist) orstrengthens (when it exists) entanglement in $XYZ$ spin chain. This impliesexistence of a relation between arrangement of spins and entanglement, in whichthe DM coupling plays an essential role. It suggests also that anisotropicantisymmetric exchange interaction could be an efficient control parameter ofentanglement in the general $XYZ$ case.

Two Qubit Entanglement in $XYZ$ Magnetic Chain with DM Antisymmetric Anisotropic Exchange Interaction