The recent experimental verification of the unique odd-frequency spin triplet superconductivity in artificial thin film ferromagnetic-superconducting structures is likely to cause a major additional surge of interest in this field. There is a timely opportunity to apply microscopic probes in this area that can complement traditional bulk measurements. We have recently demonstrated that PNR is a powerful probe of the superconducting state in such systems. We have also used low energy µSR to provide strong evidence for a modification of the superconducting state in superconducting spin valve devices. Here we propose to use PNR to complement these measurements to obtain additional information on the modification of the ferromagnetic state in these devices. These topical experiments bring together elements of strongly correlated electron physics, mesoscopic physics and spintronics.