發送短信 : Ferroelectric behavior in bismuth ferrite thin films of different thickness

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| |  \ || | || | ||  | |_| ||  | / \ ||  | |_| || 
| |__/ || | \\_/ ||  | .  //   | \_/ ||  | .  //  
|_____//   \____//   |_|\_\\    \___//   |_|\_\\  
 -----`     `---`    `-` --`    `---`    `-` --`