Generation and Detection of Magnetoelastic Waves in Magnetic Thin Films Using Planar Coils

While many magnetoelastic wave (MEW) devices employ piezoelectric methods for wave generation, the authors demonstrate the feasibility of generating and detecting MEWs using a pair of planar coils. An Fe-Si-B magnetic film sputtered onto glass was used; waves were found to propagate in both the magnetic film and the glass. For the film with an MEW velocity of 5 × 10³ km/s and coil pitch of 1 mm, the detection output should be strongest at multiples and fractions of the 5 MHz fundamental, and in fact output peaks were observed at 1.3, 1.7, and 2.5 MHz.