Preliminary report on shock remanent magnetization measurement [1] cm 10 cm 8cm 8cm [2] [3] [1] Gattacceca 1 Superconducting

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1 Preliminary report on shock remanent magnetization measurement [1] cm 10 cm 8cm 8cm [2] [3] [1] Gattacceca 1 Superconducting Quantum Interference Device Microscope SQUID D-SPIN 1 [4] 80 mt 80% 160mT 90% mm 80 mt Am 2 /kg 70 mg 3 2a ZFC remanence FC remanence cm 35 K 60 K 120 K isale Fe 7 S 8 FeTiO 3 Fe 2 O 3 Fe 3 O 4 Fe2TiO 4 1

2 10 mg B cr FORC 2b d Princeton Measurements Corporation 2b 2c Day plot [5] 19 mt Day plot 2d FORC diagram [6] FORC diagram FORCinel software [7] FORC diagram H u 80 mt cm 28 cm 100 cm 3 50 T 300 nt 26 cm 4 4 cm 0cm 2 cm 4 cm 4% mm Al 7mm km/s T mm 2mm 2mm 2mm Shot G Enterprise 50 mt mt Line A 3 6a mg Shot z 100 T Jz Jx Jz Line A B Jz 6b Jz 2

3 [2] Mitchell, D. L., R. J. Lillis, R. P. Lin, J. E. P. Connerney, and M. H. Acuna (2007), A global map of Mars crustal magnetic field based on electron reflectometry, J. Geophys. Res., 112, E Global mapping of lunar crustal magnetic fields by Lunar Prospector, Icarus, 194, isale [4] J. Gattacceca, M. Boustie, E. Lima, B.P. shock physics code Weiss, T. de Resseguier, and J.P. Cuq-Lelandais (2010), Unraveling the simultaneous shock magnetization and demagnetization of rocks, Phys. Earth Planet. Interiors, 182, [5] Day, R., M. Fuller, and V. Schmidt (1971), Hysteresis properties of titanomagnetites: grain- size and compositional dependence, Phys. Earth planet. Inter., 13, [6] Roberts, A.P., C. R. Pike, and K. L. Verosob (2000), FORC diagrams: a new tool for characterizing the magnetic properties of natural samples, J. Geophys. Res., 105, [7] Harrison, FORCinel: R.J. and J. M. Feinberg (2008), an improved algorithm for calculating [8][9] first-order reversal curve distributions using locally weighted regression smoothing, Geochem. Geophys. Geosyst., 9, Q [8] Stevenson, D. J., T. Spohn, and G. Schubert (1983), Magnetism and thermal evolution of the [1] Nagata, T (1971), Introductory notes on shock remanent magnetization and shock demagnetization of igneous rocks, Pure Appl. Geophys., 89, [3] Mitchell, D. L., J.S. Halekas, R.P. Lin, S. Frey, L.L. Hood, M.H. Acuna, and A. Binder (2008), terrestrial planets, Icarus, 54, [9] Aubert, J., S. Labrosse, and C. Poitou (2009), Modelling the palaeo-evolution of the geodynamo, Geophys. J. Int., 179,

(a) W, Up (b) 1.2 1.0 Normalized remanence 0.8 0.6 0.4 S N 0.2 E, Down 0 0 20 40 60 80 100 120 140 Alternating field (mt) Figure 1.

4 (a) W, Up (b) Normalized remanence S N 0.2 E, Down Alternating field (mt) Figure 1. Orthogonal vector plots for stepwise AFD of NRM. Closed and open symbols denote horizontal and vertical projections, respectively. (a) 0.35 (b) Remanence (Am 2 /kg) 0.30 ZFC remanence FC remanence RT-SIRM Temperature (K) Magnetic moment (Am 2 /kg) Applied field (T) (c) 1 SD (d) PSD Mrs/Ms Bcr/Bc MD Figure 2. Rock-magnetic properties of the basalt sample. (a) Hysteresis loop. (b) Day plot. (c) Low-temperature remanence curves. (d) FORC diagram.

Normalized magnetic field (%) 110 r = 0 cm r = 2 cm r = 4 cm 105 100 ±2% φ8 cm sample

5 Magnetic shield Projectile Coil Target Shield Shield Holder Jack Figure 3. Schematic diagram of the experimental system. Normalized magnetic field (%) 110 r = 0 cm r = 2 cm r = 4 cm ±2% φ8 cm sample 95 φ10 cm sample Position (cm) Figure 4. Intensity profile of magnetic field. Figure 5. Photo images of basalt sample.

6 (a) Remanence (mam 2 /kg) Jx Jy Jz Dintance (mm) (b) 0.30 Line A Line B Average Remanence (mam 2 /kg) Dintance (mm) Figure 6. SRM intensity profiles. (a) Line A. (b) Jz components of lines A and B. Table 1. Summary of the SRM acquisition experiments Shot # Projectile Velocity (km/s) Target Applied field (µt) 3107 ϕ2 mm Al ϕ10 cm L10 cm basalt ϕ2 mm Al ϕ10 cm L10 cm basalt ϕ2 mm Al ϕ10 cm L10 cm basalt ϕ2 mm Al ϕ10 cm L10 cm basalt ϕ2 mm Al ϕ10 cm L10 cm basalt ϕ2 mm Al ϕ10 cm L10 cm basalt ϕ2 mm Al ϕ8 cm L8 cm basalt ϕ2 mm Al ϕ8 cm L8 cm basalt ϕ2 mm Al ϕ8 cm L8 cm basalt ϕ2 mm Al ϕ8 cm L8 cm basalt ϕ7 mm PC ϕ8 cm L8 cm basalt ϕ7 mm PC ϕ8 cm L8 cm basalt ϕ7 mm PC ϕ8 cm L8 cm basalt 100

weak ferromagnetism observed on Shimotokuyama and Ayumikotan natural crystals behaves as pre dicted by Dzyaloshinsky and Moriya, while Wagasennin and

weak ferromagnetism observed on Shimotokuyama and Ayumikotan natural crystals behaves as pre dicted by Dzyaloshinsky and Moriya, while Wagasennin and Magnetic Behavior of a-fe2o3, I. Origin of Weak Ferromagnetism and Magnetic Characteristics Masako IWATA (The Research Institute for Iron, Steel and Other Metals, Tohoku University, Katahiracho, Sendai)