Strain‐modulated ferromagnetism at an intrinsic van der Waals heterojunction by Fujita, R, Gurung, G, Mawass, M, Smekhova, A, Kronast, F, Toh, AK, Soumyanarayanan, A, Ho, P, Singh, A, Heppell, E, Backes, D, Maccherozzi, F, Watanabe, K, Taniguchi, T, Mayoh, DA, Balakrishnan, G, van der Laan, G, Hesjedal, T