Large Built‐in Fields and Tunable Ferroelectricity in Composition‐Graded ScAlN Thin Films Deposited by Reactive Sputtering. - Nguyen, Tai; Ghosh, Anirban; Dao, Thang Duy; Koblar, Maja; Drazic, Goran; Andrianov, Nikolai; Nesterenko, Iurii; Nayak, Sanjay; Miranda, Joaquin; Golob, Andreja Bencan; Moridi, Mohssen; Deluca, Marco (Advanced Science, 2025)