Patent ID: 11934754
Assignee: KOREA INSTITUTE OF SCIENCE AND TECHNOLOGY
Field: Computer technology (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 0:
1. A method comprising:
a machine creating a simulated magnetic domain image corresponding to a spin configuration of a two-dimensional magnetic system created through computer simulation;
the machine modeling a deep neural network using the simulated magnetic domain image; and
the machine estimating a magnetic parameter value of a low-dimensional magnetic system by processing an experimentally observed magnetic domain image of the low-dimensional magnetic system using the modeled deep neural network, wherein the magnetic parameter value is at least one of Dzyaloshinskii-Moriya interaction (DMI) strength ({right arrow over (β)}ij), perpendicular magnetic anisotropy strength (Kz), and dipole interaction strength (D) of magnetic Hamiltonian H defined by an equation below:, =
  
   
    
     -
     J
    
    ⁢
    
     
      ∑
      
       
        <
        i
       
       ,
       
        j
        >
       
      
       
     
     
      
       
        S
        →︀
       
       i
      
      ·
      
       
        S
        →︀
       
       j
      
     
    
   
   -
   
    
     ∑
     
      
       <
       i
      
      ,
      
       j
       >
      
     
      
    
    
     
      
       β
       →︀
      
      ij
     
     ·
     
      (
      
       
        
         S
         →︀
        
        i
       
       ×
       
        
         S
         →︀
        
        j
       
      
      )
     
    
   
   -
   
    
     K
     z
    
    ⁢
    
     
      ∑
      i
       
     
     
      
       
        ❘
        "\[LeftBracketingBar]"
       
       
        
         S
         →︀
        
        
         i
         ,
         z
        
       
       
        ❘
        "\[RightBracketingBar]"
       
      
      2
     
    
   
   -
   
    D
    ⁢
    
     
      ∑
      
       i
       ,
       j
      
       
     
     
      
       
        3
        ⁢
        
         (
         
          
           
            S
            →︀
           
           i
          
          ·
          
           
            r
            →︀
           
           ij
          
         
         )
        
        ⁢
        
         (
         
          
           
            S
            →︀
           
           j
          
          ·
          
           
            r
            →︀
           
           ij
          
         
         )
        
       
       -
       
        
         (
         
          
           
            S
            →︀
           
           i
          
          ·
          
           
            S
            →︀
           
           j
          
         
         )
        
        ⁢
        
         
          
           ❘
           "\[LeftBracketingBar]"
          
          
           
            r
            →︀
           
           ij
          
          
           ❘
           "\[RightBracketingBar]"
          
         
         2
        
       
      
      
       
        
         ❘
         "\[LeftBracketingBar]"
        
        
         
          r
          →︀
         
         ij
        
        
         ❘
         "\[RightBracketingBar]"
        
       
       5
      
     
    
   
  
 

wherein:
J indicates exchange interaction strength,
I and j indicate two arbitrary positions in a two-dimensional magnetic system represented as a lattice structure,
{right arrow over (S)}i indicates a normalized classical spin vector located at position i,
{right arrow over (S)}j indicates a normalized classical spin vector located at position j,
{right arrow over (S)}i,z indicates a component vector in an out-of-plane direction of a normalized classical spin vector located at position i, and
{right arrow over (r)}ij indicates a non-dimensional displacement vector between position i and position j; and

controlling DMI strength of a physical Ni/[Co/Ni]2/Ir/Pt (111) system having an Ir layer by using the estimated DMI to adjust thickness of the Ir layer of the system.