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Today, one of the greatest challenges concerning the Ap/Bp stars is tounderstand the origin of their slow rotation and their magnetic fields. Thefavoured hypothesis for the latter is the fossil field, which implies that themagnetic fields subsist throughout the different evolutionary phases, and inparticular during the pre-main sequence phase. The existence of magnetic fieldsat the pre-main sequence phase is also required to explain the slow rotation ofAp/Bp stars. However, until recently, essentially no information was availableabout the magnetic properties of intermediate-mass pre-main sequence stars, theso-called Herbig Ae/Be stars. The new high-resolution spectropolarimeterESPaDOnS, installed in 2005 at the Canada-France-Hawaii telescope, provided thecapability necessary to perform surveys of the Herbig Ae/Be stars in order toinvestigate their magnetism and rotation. These investigations have resulted inthe detection and/or confirmation of magnetic fields in 8 Herbig Ae/Be stars,ranging in mass from 2 to nearly 15 solar masses. In this contribution I willpresent the results of our survey, as well as their implications for the originand evolution of the magnetic fields and rotation.

Magnetism in pre-MS intermediate-mass stars and the fossil field hypothesis