Ni-Mn-X(X=Ga,In,Sn,Sb) Heusler合金由于结构相变和磁性相变之间共同的耦合作用，在马氏体相变过程及马氏体状态下表现出奇异的磁弹、磁热、磁输运和交换偏置等物理特性。价电子浓度和晶格参数是影响马氏体相变温度的主要因素。本项目采用快淬和磁控溅射技术制备出马氏体相变温度在不同温区(TM＜TC, TM≈TC, TM ＞TC)的合金薄带及薄膜。通过磁结构相变的调控，研究合金成分、快淬工艺、生长条件及退火等制备条件对合金薄带和薄膜的相组成、相稳定性、马氏体相变特征及温度的影响规律。从原子有序-无序角度出发，系统分析马氏体转变、不同温区的磁性状态和磁交互作用对Ni-Mn-X 合金薄带及薄膜的磁热、磁电阻和交换偏置行为的影响机理。从一个统一的角度揭示Ni-Mn-X 合金薄带及薄膜的磁特性与马氏体相变的关联关系及物理本质，为拓展Ni-Mn基铁磁形状记忆合金的应用领域提供科学依据。

Ni-Mn-X (X =Ga, In, Sn, Sb) ferromagnetic shape memory alloys (FSMAs), which show shape memory effect and magnetism simultaneously, have attracted considerable interest for their potential applications in recent years, due to their ability to undergo a reversible first-order martensitic transformation (MT) from a high-temperature cubic austenite phase to a structurally modulated martensitic phase.The first-order transformation is strongly coupled with a magnetic transition that can be induced by changes in temperature, stress, as well as magnetic field and therefore some unique and promising physical properties, such as magnetic-field induced strain (MFIS), giant magnetocaloric effect (GMCE), giant magnetoresistance (GMR) and exchange bias (EB), have been observed in these alloys. The MT temperature and the Curie temperature of the martensite phase are highly sensitive to composition (corrsponding to valence electron concentration) and the Mn-Mn interatomic distance (corrsponding to atomic order) in Ni-Mn-X alloys. So far the previous work has been mostly focused on bulk polycrystalline materials produced by arc-melting with subsequent heat treatments at high temperatures for compositional homogenization. .Melt spinning has been proven to be an effective single-step processing route to synthesize ribbons with homogeneous chemical composition combining with shorter annealing time. Due to the high cooling rate, rapid solidification from the liquid phase can result in atoms being located in a non-equilibrium state. This allows for a modification of the atomic order, and thus it is of great interest to investigate melt-spun ribbon materials. Meanwhile, thin films attached to substrates have promoted their integration into magnetostrictive and magneto-optical devices designed for different microsystem technologies..In this work, the alloy ribbons with different MT temperature regions (TM＜TC, TM≈TC, TM ＞TC) are prepared by melt-spun process.A series of films with different thicknesses are deposited by DC or RF magnetron sputtering using some targets of different composition on different substrates. The effect of preparation conditions (involving alloy composition, rapid quenching process, growth conditions, elements doping, annealing temperature and time) on structure, phase components, phase transition temperature, magnetic properties will be investigated systemically. From atomic-order-disorder viewpoint, the influence of MT temperature, magnetic state, magnetic exchange interaction on magnetic entropy changes, electrical properties and exchange bias behavior will be studied in these alloys through controlling of magneto-structural phase transformation. The forming mechanism of magnetic characteristics will be described. The correlation between MT, magnetic state and magnetic characteristics will be reviewed uniformly in order to extend application fields in magnetic refrigeration, magnetic memory and microsystem technologies.