Magneto-valve nyhuv raws li hlau nqus hlau insulator
Teeb meem cov kev xav tau ntawm cov ntaub ntawv cia thiab logic cov haujlwm tom qab Moore era, spintronic cov cuab yeej muab cov lus cog tseg rau txoj kev loj hlob ntawm ntxiv mus-ntxiv microelectronic li nrog cov cell me me, tsis-volatile, tsawg zog, thiab kev kub ceev. Ntawm lawv, qhov tig lub valve yog chav tub ntxhais ntawm ntau hom kev pabcuam spintronic. Cov nqus valve feem ntau muaj cov qhaub cij tub ntxhais uas muaj ob txheej ntawm cov ferromagnetic hlau thiab ib qho tsis sib nqus ntawm cov hlau, vim yog cov hlwv ntawm cov fibomagnetic ob sab. Thauj, yog li ntawd cov tsis kam ntawm tus ntaus ntawv yog hloov los ntawm tus txheeb ze orientation ntawm ob ferromagnetic txheej. Spin-valve-raws li chav-qhov kub loj heev magnetoresistance (GMR, 1988) thiab chav kub qhov kub hlau magnetoresistance (TMR, 1995) siv tau siv ntau qhov ceev xwm ceev thiab cov sensors xws li sib nqus nyuaj disks, thiab sib nqus sensors. Nyob rau hauv tsab xov xwm, ob tug kws tshawb fawb, A. Fert ntawm Fabkis thiab P. Grünberg ntawm lub teb chaws Yelemees, yeej 2007 Nobel Prize rau hauv physics rau lawv cov discovery ntawm cov giant magnetoresistance (GMR).
Lub kiv hlua dej yog qhov zoo siab rau lub xeev ntawm txoj kev txeeb cov txheej txheem hauv kev sib nqus. Qhov quasiparticles quantized yog hu ua magnetons, thiab txhua qhov magneton nqa ib qho Planck qhov tig kiag lub zog. Piv nrog polarised kiv cua electrons hauv cov tsoos hlau, spin-wave raws li magnetons muaj qhov zoo li nram qab no: (1) Kev xa cov magnetons tsis muaj cua sov dissipation thiab cov yam ntxwv qis, thiab spins ntev ntev. Muaj cov teeb meem tseem ceeb hauv kev tshaj tawm cov ntaub ntawv; (2) Lub zog ntawm cov hlau nplaum ntawm cov magnetons muaj ob qho loj thiab cov txheej txheem theem, uas tuaj yeem ua txhaum los ntawm cov logic thiab kev ua haujlwm ntawm cov vuas Neumann system, thiab tej zaum yuav dhau los ua cov ntaub ntawv xa mus rau Moore tom qab. Ib qho tseem ceeb ntawm txoj kev ua yog; (3) Macroscopic quantum cov teebmeem xws li superfluid, superconductivity, Bose-Einstein condensate, thiab Josephson raws li magnetism kuj yog cov pob kub kub hauv cov khoom fais fab. Nyob rau hauv txoj kev tshawb no ntawm sib nqus spintronics, microwave yog qhov kev siv ntau tshaj plaws thiab kev paub txog kev paub. Txawm li cas los xij, qhov loj me me ntawm microwave yog qhov yooj yim los ua kom tiav miniaturization. Yog li, yuav siv cov khoom sib nqus hlau nplaum rau cov xov hluav taws xob ntawm semiconductor-scale, muaj kev xav tau los tsim cov kev ua kom tsis muaj zog, kev ua kom raug, thiab kev paub txog raws li hluav taws xob.
Txij xyoo 2012 txog rau xyoo 2016, lub koom haum tshawb fawb tau coj los ntawm Han Xiufeng, Lub Xeev Txoj Haujlwm Lom Zeem ntawm Kev Tshawb Fawb Ntawm Lub Tebchaws ntawm Kev Tshawb Fawb Tebchaws, Suav Academy ntawm Sciences / kub kub txoj kev kho kom dhau txoj hauv kev kuaj. Qhov kev npaj thiab kev ua haujlwm zoo tshaj qhov txwv tias YIG tuaj yeem npaj tau rau ib leeg-Crystal GGG substrates. Lub Pt / YIG / Pt hnyav hlau / nqhis hluav taws xob / hlau hnyav ¬ (HM / MI) tsim thiab npaj rau Si-SiO2 substrate. / HM) tau muab tso rau hauv kev ua haujlwm, thiab thawj zaug tau pom nyob rau hauv cov qauv los ntawm pab xibfwb Zhang Yifeng ntawm University of Arizona, cov nyhuv hlau nplaum yog kwv yees los ntawm txoj kev xav, uas yog vim muaj kev cia siab thiab kis ntawm cov magnetons nyob rau hauv YIG, ib sab ntawm Pt txheej Lub luag hauj lwm / kwj pis ntws tuaj yeem rub tus nqi rov qab / kwj ndlwg ntawm lwm sab Pt. Qhov chaw ua haujlwm no pom tseeb tias qhov sib txawv ntawm cov hlau nplaum yuav ua raws li cov kab sib txuas rau cov hlau nplaum
Tsis ntev tas los no, Han Xufeng cov pab pawg neeg tshawb fawb tau tsim kho YIG magnetic insulators li hlau nplaum hluavtaws, Au ua ib nrab txheej, thiab heteroepitaxial loj hlob ntawm GGG substrates los tsim cov khoom zoo zoo YIG / Au / YIG tshiab hlau nqus hlau insulators / hlau / Magnetic Insulator (MI / NM (Magneto-valve), thiab qhov kev soj ntsuam thawj zaug thiab tshawb pom Magnon Valve cov nyhuv hauv cov qauv no, uas yog, qhov kev taw qhia ntawm cov kev taw qhia txog qhov sib txawv ntawm qhov sib txawv ntawm ob txoj kab hlau nplaum hluavtaws tuaj yeem tswj tau Magnetic flux loj. Ua ntej, lawv zoo-tuned cov qauv siv lead ua ntawm ob lub txheej ntawm YIG los tsim cov sib txawv quab yuam kom ua tiav cov kev coj ua kom tsis muaj teeb meem hauv kev sib raug zoo ntawm cov ntxheeb ze; ib lub zos siv cua sov tam sim no yog siv los tsim kom muaj qhov kub thiab txias, thiab qhov ntev ntawm qhov ntev Seebeck tau siv los ua kom YIG qhov sib sib zog nqus dej, los ntawm cov hlau nplaum sib nqus qhov sib nqus ntawm cov hlau nplaum, muaj peev xwm paub tias kev ntsuas hluav taws xob los ntawm kev siv hluav taws xob hauv Pt; ces nws pom cov hlau nplaum magnetic valve nyhuv, uas yog, tus txheeb ze txheeb ze ntawm ob txheej YIG tuaj yeem tswj los ntawm Magnetohydrodynamic flux me me ntawm qhov sib nqus valve, nyob ntawm tus txheeb ze magneto-valve ratio (MVR) ntawm lub tiaj tus thiab kev pov hwm -Ntsev lub xeev thaum nyob hauv tsev sov tuaj yeem ncav 19%; thiab nws qhia tau tias qhov piv ntawm qhov sib txawv ntawm qhov sib txawv ntawm qhov sib txawv ntawm qhov sib nqus insulator / Qhov kub ntawm qhov kev hloov ntawm cov hlau nplaum magnetron-electron hauv cov hlau hlau yog ua raws li qhov kev ntsuam xyuas theoretical; qhov tig diffusion ntawm Au yog tau los ntawm kev haum ntawm kev vam khom ntawm kev sib piv ntawm cov hlau nplaum thiab Au thickness. Qhov ntev yog 15.1 nm, uas yog muaj raws li cov txiaj ntsig tau los ntawm kev sib tw cov qauv [Hao Wu thiab XF Han et al., Phys. Rev. Lett. 120 (2018) 097205, DOI: https://doi.org/10.11 03 / PhysRevLett.120.097205, Editors 'Suggest & Featured hauv Physics].
Lub YIG / Au / YIG, tus tshiab sib nqus insulator / nruab nrab txheej / sib nqus hlau insulator (MI / NM / MI) uas muaj qhov sib txawv ntawm qhov kev tshawb fawb no yog nws yog ib qho hloov ntaub ntawv xa tawm thiab cov kev ua lag luam. Lub tshuab nqus hlau ntaus hlau yooj yim kuj tseem yog cov khoom thiab lub hauv paus rau yav tom ntej kev tshawb fawb thiab kev loj hlob ntawm cov khoom sib nqus raws li kev sib nqus cov kwj deg, logic, cia, diodes, transistors, waveguides, thiab keyboards. Nws qhia tau hais tias ib chav kawm tshiab ntawm spintronics core devices nrog sib nqus insulators li spin-cov ntaub ntawv muaj nyob rau hauv cov hlau nplaum hlau uas muaj feem xyuam ceev nrooj, thiab kev ua rau cov khoom, physics, thiab cov cuab yeej yuav ua rau kom qis zog, rov sau dua, Lub hnub yug tshiab uas tsis yog- nrov nta thiab high-frequency lub computer series cov khoom siv. Thiab qhov sib nqus ntawm qhov sib nqus ntawm qhov sib nqus no tau muab coj los sib piv nrog cov txheej txheem loj thiab loj ntawm kev sib cog lus, uas muaj txiaj ntsig rau kev sib koom ua ke nrog yav tom ntej thiab kev siv ntau yam khoom sib nqus, cov khoom siv spintronic thiab semiconductor microelectronic.
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