FundPrimer(1) - :JUII AlISHlAiNn lnOHnd'HSlHJll3W lHIW AD r...

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SYSTEM COMPONENTS I,"percon~ucllng compongnts shnwn in bloc) I. Sample Rod 8. SQUID Capsule with Magnetic Shield 2. Sample Rotator 9. Superconducting Pick-up Coil 3. Sample Transport 10. Dewar Isolation Cabinel 4. Probe Assembly II. Dewar 5. Helium Level Sensor 12. HP Thinkjel Printer 6. Superconducling Solenoid 13. Magnet Power Supply 7. Flow Impedance 14. Model 1802 Temperature Controller IS. Console Cabinel 16. Power Distribution Unit 17. Model 1822 MPMS Controller 18. GasIMagnet Control Unit 19. HP Vectra Computer 20. Monitor 2_-1'-. 15 20 18 0 : __ 17 0 a 0 14 16 a 0 0 0 9 7 8
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FUNDAMENTALS OF MAGNETISM AND MAGNETIC MEASUREMENTS FEATURING QUANTUM DESIGN'S MAGNETIC PROPERTY MEASUREMENT SYSTEM By MIKE MCElfRESH PURDUE UNIVERSITY r ~ QUANTUM ~ "'-"'" ~.DESIGN
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PART I: INTRODUCTION TO THE QUANTUM DESIGN MAGNETIC PROPERTY MEASUREMENT SYSTEM 5 A. SUPERCONOUCTING COMPONENTS 5 IHE SQUID _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 5 IHE SUPERCONOUCIING SHIELD ._ _._ _ _ .. _ _ _ .. _ _ _ _ _ _ _ _ _ _ _ _ _ .. _ .. _ .. _ _ .. _ _ _ _.R IHE SUPERCONOUCIING OETEGIION COll _ .. _ .. _ .. _ _ .. _ _ .. _ _ _ _ _ _ _ .. _ _ _ _ .. _ .. _ .. _ .. _ ... _ _ _ _R IHE SUPERCONOUCIING MIGNET_ .. _ ... _ .. _._ .. _._ .. _ .. _ .. _._ .. _ _ _ _ .. _ _ .. _._ .. _ .. _ _ .. _ .. _ .. _ .. _ _ .. _ _.7 B. SAMPLE SPACE AND TEMPERATURE CONTROL 9 C. THE MEASUREMENT PROCEDURE 10 SIMPLEJRINSP08l_._ .. _.. 10 OUIPUI OF SIGNllINllYSIS- . 11 MODES FOR OPERITION OF IHE MAGNET _ .. _. .. __ ._. __ ... 12 FURIHER INFORMIIION .. _ ... _ .. _._ .. _._._._._ .. _ _._ .. _ _ _ _ _ .. _ .. _._ .. _ .. _ .. __ ._ .. _._._._ .. _ _12 O. ENGINEERING DESIGN TRAOEOFFS 12 IHE SIMPLE CHAM8ER _ _ .. _ .. _ _ .. _ .. _ _ _ .. _ _ .. _ _ _ _ _ _ _ _ _ _ _ .. _ _ .. _ _ _ .. _ _ .. _.12 IHE DETECTION COll ... _ _ _ ... _ _ _ .. _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _13 IHE SUP ERCONOUCIING MIGNET._ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _.13 PART II. MAGNETIC UNITS OF MEASURE 15 PART III. TVPES OF MAGNETIC BEHAVIOR 17 A. PARAMAGNETISM : 17 INIROOUCTION 17 ClII'le·Type Parf/maglletisllI " " .. ", .. ", .. " .. ", .. ", .. ", .. ", .. "".", .. ", .. ", .. ", .. ", .. ", .. ", .. ", .. ", .. ", .. ", .. ", .. ", .. ", .. ", .. " ", .. " " .. ", " " 18 UNIIS 18 EKAMPLES AND ADVANCED 10PICS 18 C"t'ie Paramaglletism " " " " " " " ,, " 18 OIHER TYPES OF PARAMAGNETISM 10 Cllrle·1Velss Pa,'amaglletism 19 Pauli Paramagnetism alld Vall Vleck Pal'amagllelisim 20 Co'llbillafio"s 20 B. DIAMAGNETISM 20 C. fERROMAGNETISM 21 INIROOUCTION _ _ _ _ .. _ _ _ _ _ _ _ _ .. _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _21 UNIIS _ _ _ _ _ _ .. _ .. _ _ _ _ _ .. _ .. _ _ _ .. _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 22 EXAMPLES INO ADVINCEO 10PICS _ _ _ .. _ .. _ _ .. _ _ _ .. _ _ _ _ _ ... _ _ _ .. _ .. _ .. _ _ .. _ _ .. _ .. _ _ _ ... _ 23 Histo,y Depelldellce _ .. _ _ _ .. _ .. _ .. _ _ _ _ .. _ _ _._ .. _ .. _ .. _ .. _ _ .. _ .. _ _ _ .. _ .. _ .. _.23 A/aglletic DomaillS ... _ .. _._._._._._._. __ ._._._._ .. _._._._ .. _ .. _ .. _ .. _ .. _ .. _ .. _ .. _ .. _ .. _ .. _ .. _._._. ._._._. __ .24 Magnetic Recordi"g alld Trallsjonller Coils __ .. _ .. _ .. _ .. _ .. _ .. _ .. _ .. _ .. _ .. _ .. _ .. _ .. _ .. _ .. _ ....... _ .. _ .. _._ .. _ .. _ .. __ .. _ .. _ ... _ ... _._25
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D. ANTlfERROMAGNETISM ANO FERRIMAGNETISM ................................................... .............................. ........... ..... .................................. 25 ANIIFERRDMAGNEIISM 25 FERRIMAGNEIISM _ _ 2R UNII8- _ _ _ _ _ _ _ _ _ .. _ _ _ _ _ _ _ _ _ 28 E. SUPERCONOUCTIVITY.. 2B INIROOUCIION _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 28 UNIIS _ _ _ _ _ _ _ _ _ _ _ _ _ .. _ .. _ .. _ _ _ _ .. _ _ _ _ _ _28 EXAMPLES AND ADVANCED lOPICS _ _ _ _ _ _ _ _ _ _ _ _ .. _ .. _ .. _ _ _ _ _ .. _ _ _ _ _ _ 28 IrrtllersibifilJ Li"e _._._._ .. __ ._._._._._._ .. _ .. _ .. _ H .. _ _ .. _._ .. _ .. _ _ _ .. _ _ _ _ _ ••• _ •• 28 MIl/or Loops . __ ._._._ .. _._._._._._._._. __ ._._._._._ .. _ .. _ .. _ .. _._ ... _._ _._ .. _._ .. _ .. _._ .. _ .. _ .. _ .. _ _ .. _ _ 29 Time Depe"dellce . ._._. . . __ .. _._ .. _ _._._ .. _ .. _ .. _ .. _ .. _ .. _ _ _.30 F. DEMAGNETIZATION CORRECTIONS 30 G. MAGNETIC CHARACTERIZATION Of A NEW MATERIAL 31 PART IV: ApPENOICES 33 A. TABLE Of CONVERSIONS 33 B. RECOMMENOEO REAOING 34
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I was rery pleased when Barry Lindgren, the President of Quantum Design, offered me the chance to put down in writing information that I consider prJctical ;md valuable, yet which has no pallicular place in the published literalUre. This information was acquired orer many years, mostly through numerous discussions with colleagues in the research community and those at Quantum Design.
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