Towards wafer scale inductive characterization of spin transfer torque critical current density of magnetic tunnel junction stacks

Autor: Sievers, Sibylle, Liebing, Niklas, Serrano-Guisan, Santiago, Ferreira, Ricardo, Paz, Elvira, Caprile, Ambra, Manzin, Alessandra, Pasquale, Massimo, Skowroński, Witold, Stobiecki, Tomasz, Rott, Karsten, Reiss, Günter, Langer, Jürgen, Ocker, Berthold, Schumacher, Hans Werner
Rok vydání: 2014
Předmět:
Druh dokumentu: Working Paper
DOI: 10.1109/TMAG.2014.2357808
Popis: We explore the prospects of wafer scale inductive probing of the critical current density $j^{c0}$ for spin transfer torque switching of a CoFeB/MgO/CoFeB magnetic tunnel junction with varying MgO thickness. From inductive measurements magnetostatic parameters and the effective damping are derived and $j^{c0}$ is calculated based on spin transfer torque equations. The inductive values compare well to the values derived from current induced switching measurements on individual nanopillars. Using a wafer scale inductive probe head could in the future enable wafer probe station based metrology of $j^{c0}$.
Databáze: arXiv