Structural analysis and magnetic properties of(Pt/Co)3/PttPt/IrMnmultilayers

Structural and magnetic investigations of ${\text{Ta}}_{3\text{ }\text{nm}}/{[{({\text{Pt}}_{2\text{ }\text{nm}}/{\text{Co}}_{0.4\text{ }\text{nm}})}_{3}/{\text{Pt}}_{t\text{Pt}}/{\text{IrMn}}_{7\text{ }\text{nm}}]}_{7}/{\text{Pt}}_{10\text{ }\text{nm}}$ multilayers with ${t}_{\text{Pt}}=0$ and ${t}_{\text{Pt}}=0.4\text{ }\text{nm}$ have been carried out using x-ray reflectometry, tomographic atom probe, and superconducting quantum interference device magnetometry. The structural investigations show that the Co/IrMn interface is more diffuse in the absence of the Pt spacer. The consequences on the magnetic properties are discussed. The exchange-bias field and the anisotropy direction of these two specimens are analyzed in comparison to ${\text{Ta}}_{3\text{ }\text{nm}}/[{({\text{Pt}}_{2\text{ }\text{nm}}/{\text{Co}}_{0.4\text{ }\text{nm}})}_{3}/{\text{Pt}}_{t\text{Pt}}/{\text{IrMn}}_{7\text{ }\text{nm}}]/{\text{Pt}}_{10\text{ }\text{nm}}$ multilayers containing only one ferromagnetic/antiferromagnetic repeat and correlated with the structural investigations.