A microfabricated magnetic field transducer uses a magnetically sensitive structure in combination with one or more permeable magnetic flux guides. The flux guides may route off-axis components of an externally applied magnetic field across the sensitive axis of the magnetically sensitive structure, or may shield the magnetically sensitive structure from off-axis, stray fields or noise sources. A combination of flux guides and magnetically sensitive structures arranged on a single substrate may enable an integrated, 3-axis magnetometer in a single package, greatly improving cost and performance.