Antiferromagnetic Mn3Sn Film Formation via Sputtering and Crystallization
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Solution Overview
Problem
Current methods lack a reliable approach for forming magnetic layers of specific thicknesses, particularly for antiferromagnetic materials like Mn3Sn and Mn3Ge, which hinders the integration and performance of magnetic storage elements due to increased leakage magnetic fields and challenges in achieving the desired crystalline state.
Innovation Solution
A method involving sputtering and subsequent crystallization of amorphous magnetic films using targets with Mn3Sn, Mn3Ge, or Mn1-xFexGe as main components, with specific temperature and pressure controls to form crystalized antiferromagnetic thin films, and using base layers of Ti, Ru, Al, Pt, Ag, or Au to enhance the crystalline state and maintain stoichiometric ratios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a magnetic layer is formed of ferromagnetic material to achieve magnetic storage function, then magnetic storage capability is improved, but leakage magnetic field increases which hinders high integration
Solution Approach 1:
The patent changes the magnetic properties parameter of the storage layer by using antiferromagnetic materials (Mn3Sn, Mn3Ge, or (Mn1-xFex)Ge) instead of ferromagnetic materials. This parameter change transforms the magnetic behavior from ferromagnetic with leakage fields to antiferromagnetic with suppressed leakage fields, resolving the contradiction between storage capability and leakage reduction
Solution Approach 2:
The patent creates a composite structure consisting of a base layer and an antiferromagnetic storage layer. The base layer provides structural support while the antiferromagnetic storage layer provides storage function with reduced leakage. This composite approach allows achieving both magnetic storage capability and reduced harmful leakage fields
2Object-generated harmful factors
If the thickness of antiferromagnetic magnetic layer is reduced to several tens to hundreds of nanometers for high integration, then leakage magnetic field is suppressed, but a reliable formation method for such thin films has not been established
Solution Approach 1:
The patent applies preliminary action by forming the magnetic layer in an amorphous state first through sputtering, then subsequently crystallizing it through heating. This two-step approach allows precise control of thin film formation at room temperature followed by controlled crystallization, enabling reliable formation of thin antiferromagnetic layers that would be difficult to crystallize directly
Solution Approach 2:
The patent utilizes parameter changes by controlling the crystallization temperature within a specific range (225-400°C) to transform the amorphous magnetic layer into a crystalline state. This temperature parameter control enables the formation of thin crystalline antiferromagnetic films with precise thickness control, resolving the manufacturing precision issue
3Manufacturing precision
If sputtering is performed at low substrate temperature to prevent Sn evaporation and maintain stoichiometric ratio, then composition precision is improved, but film crystallization becomes difficult
Solution Approach 1:
The patent segments the film formation and crystallization processes into distinct stages: first forming the amorphous film at low temperature to maintain stoichiometric ratio, then separately performing crystallization at elevated temperature. This segmentation allows each process to be optimized independently, resolving the contradiction between composition precision and crystalline state
Solution Approach 2:
The patent applies preliminary action by completing the film deposition with precise stoichiometric control first, then subsequently applying heat treatment for crystallization. This preliminary formation of amorphous film with correct composition precedes the crystallization step, ensuring both composition precision and crystalline structure are achieved
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method effectively forms crystalized antiferromagnetic thin films, ensuring precise composition and enhanced crystalline state, thereby addressing the integration challenges and leakage magnetic field issues in magnetic storage elements.
Implementation Method 1
forming an amorphous magnetic film on a film formation subject by sputtering a target that includes any one selected from a group consisting of Mn3Sn, Mn3Ge, and (Mn1-xFex)Ge as a main component
Implementation Method 2
crystalizing the amorphous magnetic film by heating the amorphous magnetic film. The crystalizing includes heating the amorphous magnetic film to a temperature that is greater than or equal to 225° C. and less than or equal to 400° C.
Implementation Method 3
crystalizing the amorphous magnetic film by heating the amorphous magnetic film
Data Source
AI summary
A method includes forming an amorphous magnetic film on a film formation subject by sputtering a target that includes any one selected from a group consisting of Mn3Sn, Mn3Ge, and (Mn1-xFex)Ge as a main component and crystalizing the amorphous magnetic film by heating the amorphous magnetic film. The crystalizing includes heating the amorphous magnetic film to a temperature that is greater than or equal to 225° C. and less than or equal to 400° C.