Apple and Samsung have long been at war and as part of this war, Apple has started to pull away from Samsung. It started when they looked to other sources for screens for their iPhone 5S and 5C and now it is extending beyond that to the chips that power the devices themselves. ARM designs the chips and then companies like Quallcomm, Samsung and TSMC actually produce the chips. It seems that TSMC is getting Apple's business at the moment, and while that is no surprise, it has cost Samsung $851 Million in revenue.
All of those A7 and A8 chips that power Apple’s iPhones and iPads were created by Samsung. The process of how the chips are created starts in cupertino. Apple designs the chips using architecture provided by ARM, which is a British Chip company. Apple then sends those designs over to Samsung for them to manufacture the chip. Reportedly, Apple has jumped ship and has headed over to Taiwan-based TSMC for all of their chip manufacturing needs. The move of course is a result of their ever going war.