This paper is devoted to the spectral analysis of the magnetic Laplacian with semiclassical parameter h> 0 , defined on a bounded and regular domain Ω of R2 with Neumann magnetic boundary condition, in the case when the magnetic field vanishes along a smooth curve intersecting ∂Ω. We investigate the behavior of the eigenvalues and the associated eigenfunctions when the semiclassical parameter h tends to 0. We provide a one term asymptotic of the first eigenvalue as well as a full asymptotic expansion of the bottom of the spectrum as h→ 0.
