Spin-resolved off-specular neutron scattering from magnetic domain walls using the polarized $^3He$ gas spin filter
| dc.creator | Radu, F. | |
| dc.creator | Vorobiev, A. | |
| dc.creator | Major, J. | |
| dc.creator | Humblot, H. | |
| dc.creator | Westerholt, K. | |
| dc.creator | Zabel, H. | |
| dc.date | 2002-12-04 | |
| dc.date.accessioned | 2026-07-07T06:24:19Z | |
| dc.date.available | 2026-07-07T06:24:19Z | |
| dc.description | We report on the use of the polarized $^3$He gas filter and neutron resonant enhancement techniques for the measurement of spin-polarized diffuse neutron scattering due to ferromagnetic domains. A CoO/Co exchange biased bilayer was grown on a Ti/Cu/$Al_2O_3$ neutron resonator template. The system is cooled in an applied magnetic field of $H_a=2000$ Oe through the Néel temperature of the antiferromagnet to 10 K where the applied magnetic field is swept as to measure the magnetic hysteresis loop. After the second magnetization reversal at the coercive field $H_{c2}=+ 230$ Oe, the system is supposed to approach the original magnetic configuration. In order to prove that this is not the case for our exchange biased bilayer, we have measured four off-specular maps I++, I+-, I-+, I-- at $H_a \approx + 370$ Oe, where the Co magnetic spins were mostly reversed. They show a striking behavior in the total reflection region: while the nonspin-flip scattering exhibits no diffuse reflectivity, the spin-flip scattering shows strong diffuse scattering at incident angles which satisfy the resonance conditions. Moreover the spin-flip off-specular part of the reflectivity is asymmetric. The I-+ intensity occurs at higher exit angles than the specularly reflected neutrons, and the I+- intensity is shifted to lower angles. Their intensities are noticeably different and there is a splitting of the resonance positions for the up and down neutron spins ($α_{n} ^{+} \ne α_{n} ^{-}$) . Additionally, a strong influence of the stray fields from magnetic domains to the resonance splitting is observed. | |
| dc.identifier | https://arxiv.org/abs/cond-mat/0212092 | |
| dc.identifier | http://arxiv.org/abs/cond-mat/0212092 | |
| dc.identifier | Physica B 335, 63-67 (2003) | |
| dc.identifier | doi:10.1016/S0921-4526(03)00192-3 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/96502 | |
| dc.subject | Materials Science | |
| dc.title | Spin-resolved off-specular neutron scattering from magnetic domain walls using the polarized $^3He$ gas spin filter | |
| dc.type | text |