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Due to a weaker exchange coupling, the coercivity in permalloy/Cr 82 Al 18 bilayers of thicknesses t FM and t AF , respectively, has been found to vary as 1/t FM 3/2 at room temperature, a behavior previously only observed at low temperatures. At room temperature, the exchange field decreases when t AF is less than 40 nm and vanishes at 25 nm. Switching in wedged-permalloy/Cr 82 Al 18 bilayers consists of two macroscopic domains with one domain wall moving along the wedge direction.doi:10.1063/1.372802 fatcat:m5wprmtjmzhzvjnioa4rssba2m