ALBERTO BOLLERO REAL

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Notation and quantities [units] A exchange stiffness [Jm -1 ] at.% atomic per cent α’ relative remanence (BH) max maximum energy product [kJm -3 ] χ irr irreversible susceptibility [T -1 ] d grain size d c DSC DU δ w critical single-domain particle size [nm] Differential Scanning Calorimetry die-upsetting domain wall width [nm] E a anisotropy energy [Jm -3 ] EDX Energy Dispersive X-ray Analysis ε degree of deformation after die upsetting HDDR Hydrogenation-Disproportionation-Desorption-Recombination HRTEM High resolution transmission electron microscopy IM Intensive milling J polarisation [T] J r (m/d) J r J rev J s remanence [T] remanent polarisation during magnetisation (m) or demagnetisation (d) [T] reversible change in polarisation [T] saturation polarisation [T] K anisotropy constant [Jm -3 ] l ex exchange length [nm] m magnetic moment [JT -1 ] M magnetisation [Am -1 ] MS Melt-spinning µ 0 permeability of vacuum [µ 0 = 4π × 10 -7 Tm/A] µ 0 H appl applied field [T] µ 0 H c coercivity [T] vii
µ 0 H no nucleation field [T] µ 0 H r remanent coercivity [T] R rare-earth element SEM Scanning Electron Microscopy σ deformation stress [MPa] T transition-metal element T C Curie temperature [ o C] TEM Transmission Electron Microscopy TPA Temperature Pressure Analysis T x onset of crystallisation temperature [ o C] VSM Vibrating Sample Magnetometer wt.% weight per cent XRD X-ray diffraction viii
Page 1 and 2: Alberto Bollero Real Isotropic Nano
Page 3 and 4: Die vorliegende Dissertationsschrif
Page 5 and 6: when varying (i) the α-Fe content,
Page 7 and 8: liefert wichtige Informationen übe
Page 9: 6.1.2. Milled and melt-spun alloys
Page 13 and 14: 1 Introduction J s = 0.5 can not be
Page 15 and 16: 2 Magnetism of R-T intermetallic co
Page 17 and 18: 2.2 Magnetic properties 2.2 Magneti
Page 19 and 20: 2.2 Magnetic properties classified
Page 21 and 22: 2.2 Magnetic properties sublattice
Page 23 and 24: 2.2 Magnetic properties where the m
Page 25 and 26: 2.2 Magnetic properties highly stru
Page 27 and 28: 3 The exchange-coupling mechanism A
Page 29 and 30: 3.1 Models enhancement to those obt
Page 31 and 32: 3.2 Wohlfarth’s relation and Henk
Page 33 and 34: 3.3 Magnetisation reversal processe
Page 35 and 36: 3.4 Development of exchange-coupled
Page 37 and 38: 3.4 Development of exchange-coupled
Page 39 and 40: 4 Systems under investigation 4.1 N
Page 41 and 42: 4.2 NdCoB 4.2 NdCoB The tetragonal
Page 43 and 44: 4.3 PrFeB e 1 p 1 Fig. 4.4: Liquidu
Page 45 and 46: 5 Experimental details The differen
Page 47 and 48: 5.1 Nanocrystalline powder processi
Page 49 and 50: 5.2 Structural characterisation and
Page 51 and 52: 5.2 Structural characterisation whe
Page 53 and 54: 5.3 Characterisation of magnetic pr
Page 55 and 56: 6.1 Thermal characterisation The te
Page 57 and 58: 6.2 Microstructural characterisatio
Page 59 and 60: 6.3 Characterisation of magnetic pr
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6.3 Characterisation of magnetic pr
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6.3 Characterisation of magnetic pr
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6.4 Hot workability necessary for N
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6.5 Summary advantage of the Pr-con
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7.1 Characterisation of the base al
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7.3 Summary Magnetisation ( arb. un
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8.1 Initial magnetisation processes
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8.1 Initial magnetisation processes
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8.2 Recoil loops at room temperatur
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8.3 Analysis of exchange-coupling u
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8.4 Summary An analysis of the init
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Fig. 9.1: Dependence of the lattice
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9.1 Reactive milling of a PrFeB all
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9.2 Reactive milling of Nd(Fe,Co)B
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9.3 Summary of J r = 0.91 T after a
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10 Conclusions and future work 10 C
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10 Conclusions and future work the
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10 Conclusions and future work spin
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10 Conclusions and future work (Mö
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REFERENCES [13] O. Gutfleisch, K. K
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REFERENCES [37] J.J. Croat, J.F. He
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REFERENCES [60] J. Bauer, M. Seeger
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REFERENCES [83] S. Hirosawa, Y. Mat
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REFERENCES [106] R.W. Lee, “Hot-p
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List of publications: Some parts of
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Acknowledgments The realisation of
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ALBERTO BOLLERO REAL

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