  In this chapter we will describe a new development of combinatorial pulsed
laser deposition (CPLD) which targets the exploration of interface libraries.
The idea is to modulate continuously the composition of interfaces on a few
atomic layers in order to alter their functional properties. This unique
combinatorial synthesis of interfaces is possible due to very specific PLD
characteristics. The first one is its well-known ability for complex oxide
stoichiometry transfer from the target to the film. The second one is the layer
by layer control of thin film growth at the atomic level using in-situ RHEED
characterization. The third one relates to the directionality of the ablated
plume which allows for selective area deposition on the substrate using a
mobile shadow-mask. However PLD also has some limitations and important PLD
aspects to be considered for reliable CPLD are reviewed. Multiple examples
regarding the control of interface magnetism in magnetic tunnel junctions and
energy band and Schottky barrier height tuning in ferroelectric tunable
capacitors are presented.
