é•·è°·å·ç ”究室ã«ã¯ã€ã•ã¾ã–ã¾ãªã‚¿ã‚¤ãƒ—ã®èµ°æŸ»ãƒˆãƒ³ãƒãƒ«é¡•å¾®é¡ï¼ˆï¼³ï¼´ï¼ï¼‰ãŒã‚ã‚Šã¾ã™ã€‚ãã‚Œãžã‚Œã€æ¸¬å®šæ™‚ã®è©¦æ–™ã®ç’°å¢ƒãŒç•°ãªã£ã¦ãŠã‚Šã€æ¸¬å®šç‰©ã‚„観察ã—ãŸã„ç¾è±¡ã«åˆã‚ã›ã¦ã€é©å½“ãªé¡•å¾®é¡ã‚’é¸æŠžã—ã¦å®Ÿé¨“ã‚’è¡Œã£ã¦ã„ã¾ã™ã€‚ ã“れらã®é¡•å¾®é¡ã¯ã€ã„ãšã‚Œã‚‚振動ノイズã«å¯¾ã—ã¦æ•æ„ŸãªãŸã‚ã€ç©ºæ°—ã°ãã«ã‚ˆã‚‹é™¤æŒ¯å°ã®ä¸Šã«è¼‰ã›ã‚‰ã‚Œã¦ã„ãŸã‚Šã€å ´åˆã«ã‚ˆã£ã¦ã¯ã€é˜²éŸ³å®¤ã®ä¸ã«å…¥ã£ã¦ã„ã¾ã™ã€‚
We have various types of scanning tunneling microscopy (STM). They are used depending on purposes. Since all systems are sensitive to vibrations, some of them are on an anti-vibration table and in a soundproof room.
4He refrigerator UHV STM (Unisoku)
ã“ã®è£…ç½®ã§ã¯ã€è©¦æ–™ã‚’液体ヘリウム温度(通常4.2Kã€ãƒãƒ³ãƒ—ã§å¼•ã„ã¦2.6K)ã¾ã§å†·å´ã—ã€é¢ç›´ã«11ï¼´ã‚‚ã—ãã¯é¢ç›´2T・é¢å†…1Tã®ç£å ´ã‚’ã‹ã‘ãŸçŠ¶æ…‹ã§STM観察を行ã†ã“ã¨ãŒã§ãã¾ã™ã€‚
走査トンãƒãƒ«ãƒãƒ†ãƒ³ã‚·ãƒ§ãƒ¡ãƒˆãƒªã‚„マイクãƒæ³¢å°Žå…¥ã‚‚試ã¿ã¦ã„ã¾ã™ã€‚
This system can be cooled down to 4.2K by liquid He and to 2.6K by pumping. 11T (out-of-plane) or 2T (out-of-plane) and 1T (in-plane) magnetic fields can be applied.
We are also trying to combine with scanning tunneling potentiometry and microwave.
3He refrigerator UHV STM (Unisoku)
ã“ã®è£…ç½®ã§ã¯ã€ãƒˆãƒƒãƒ—ãƒãƒ¼ãƒ‡ã‚£ãƒ³ã‚°ã®3He冷å‡æ©Ÿã§æœ€ä½Žæ¸©åº¦300 mKã®ä½Žæ¸©ã€è¶…ä¼å°Žãƒžã‚°ãƒãƒƒãƒˆã‚’用ã„ã¦7 Tã¾ã§ã®å¼·ç£å ´ä¸ã§STM観察を行ã†ã“ã¨ãŒå‡ºæ¥ã¾ã™ã€‚
This system can be cooled down to 0.4K by 3He refrigerator. 7T (out-of-plane) magnetic fields can be applied.
Room temperatureUHV STM/AFM (Omicron)
Omicron社ã®å®¤æ¸©åž‹STM装置ã§ã€å‘¨æ³¢æ•°å¤‰èª¿AFMã¨ã—ã¦å‹•ä½œã•ã›ã‚‹ã“ã¨ã‚‚å¯èƒ½ã§ã™ã€‚ã¾ãŸã€è¡¨é¢ã®ãƒãƒ†ãƒ³ã‚·ãƒ£ãƒ«ã‚’測定ã™ã‚‹èµ°æŸ»ãƒˆãƒ³ãƒãƒ«ãƒ»ãƒãƒ†ãƒ³ã‚·ãƒ§ãƒ¡ãƒˆãƒªãƒ¼ã®å®Ÿé¨“ã‚‚è¡Œã£ã¦ã„ã¾ã™ã€‚
This STM (Omicron) is operated in room temperature, which also works as FM-AFM. We work on scanning tunneling potentiometry using this system.
Synchrotron radiation UHV STM (home built)
ç‰©æ€§ç ”ç©¶æ‰€è»Œé“æ”¾å°„ç‰©æ€§ç ”ç©¶æ–½è¨ã®æœ¨ä¸‹ç ”究室(ç¾Spring 8)ã¨å…±åŒã§é–‹ç™ºã—ãŸï¼³ï¼´ï¼ã§ã™ã€‚放射光ãªã©ã®å…‰ã‚’当ã¦ãªãŒã‚‰ï¼³ï¼´ï¼åƒã‚’ã¨ã‚‹ã“ã¨ãŒã§ãã€ï¼³ï¼´ï¼åƒè¦³å¯Ÿã¨åŒæ™‚ã«å…ƒç´ 分æžã‚„ç£æ°—æƒ…å ±ã‚’å¾—ã‚‹ã“ã¨ã‚’目的ã¨ã—ã¦ã„ã¾ã™ã€‚
This system was built in joint project with synchrotron radiation facility. STM image can be obtained irradiated with
synchrotron radiation. We are interested in elements-resolved STM study.
High vacuum AFM/STM/Scanning Tunneling Potentiometer (Shimadzu-based home built)
コンタクトモードãŠã‚ˆã³ãƒ€ã‚¤ãƒŠãƒŸãƒƒã‚¯ãƒ¢ãƒ¼ãƒ‰ã§è¡¨é¢ã®å‡¹å‡¸ã‚’観察ã§ãるAFï¼ã§ã™ã€‚超高真空ã§ã¯ãªã„ã®ã§ã€æ°—楽ã«æ“作ã§ãã¾ã™ã€‚ パターン作æˆã‚„ãƒãƒ†ãƒ³ã‚·ãƒ£ãƒ«æ¸¬å®šã«ã‚‚応用ã—ã¦ã„ã¾ã™ã€‚
This system works as contact and dynamic mode AFM in high vacuum (not ultrahigh vacuum).