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We study the magnetic structure of the ground state of an itinerant Fermisystem of spin-\nicefrac{1}{2} particles with magnetic dipole-dipoleinteractions. We show that, quite generally, the spin state of particles dependon its momentum, i.e., spin and orbital degrees of freedom are entangled andtaken separately are not ``good'' quantum numbers. Specifically, we consider auniform system with non-zero magnetization at zero temperature. Assuming themagnetization is along $z$-axis, the quantum spin states are $\v{k}$-dependentlinear combinations of eigenstates of the $\sigma_z$ Pauli matrix. This leadsto novel spin structures in \textit{momentum space} and to the fact that theFermi surfaces for ``up'' and ``down'' spins are not well defined. The systemstill has a cylindrical axis of symmetry along the magnetization axis. We alsoshow that the self energy has a universal structure which we determine based onthe symmetries of the dipolar interaction and we explicitly calculated it inthe Hartree-Fock approximation. We show that the bare magnetic moment ofparticles is renormalized due to particle-particle interactions and we giveorder of magnitude estimates of this renormalization effect. We estimate thatthe above mentioned dipolar effects are small but we discuss possible scenarioswhere this physics may be realized in future experiments.

Unconventional magnetism in imbalanced Fermi systems with magnetic dipolar interactions