33 research outputs found
Quantum Transport with Spin Dephasing: A Nonequilibrium Green's Function Approach
A quantum transport model incorporating spin scattering processes is
presented using the non-equilibrium Green's function (NEGF) formalism within
the self-consistent Born approximation. This model offers a unified approach by
capturing the spin-flip scattering and the quantum effects simultaneously. A
numerical implementation of the model is illustrated for magnetic tunnel
junction devices with embedded magnetic impurity layers. The results are
compared with experimental data, revealing the underlying physics of the
coherent and incoherent transport regimes. It is shown that small variations in
magnetic impurity spin-states/concentrations could cause large deviations in
junction magnetoresistances.Comment: NEGF Formalism, Spin Dephasing, Magnetic Tunnel Junctions,
Magnetoresistanc
Influence of s-d interfacial scattering on the magnetoresistance of magnetic tunnel junctions
We propose the two-band s-d model to describe theoretically a diffuse regime
of the spin-dependent electron transport in magnetic tunnel junctions (MTJ's)
of the form F/O/F where F's are 3d transition metal ferromagnetic layers and O
is the insulating spacer. We aim to explain the strong interface sensitivity of
the tunneling properties of MTJ's and investigate the influence of electron
scattering at the nonideal interfaces on the degradation of the TMR magnitude.
The generalized Kubo formalism and the Green's functions method were used to
calculate the conductance of the system. The vertex corrections to the
conductivity were found with the use of "ladder" approximation combined with
the coherent-potential approximation (CPA) that allowed to consider the case of
strong electron scattering. It is shown that the Ward identity is satisfied in
the framework of this approximation that provides the necessary condition for a
conservation of a tunneling current. Based on the known results of ab-initio
calculations of the TMR for ballistic junctions, we assume that exchange split
quasi-free s-like electrons with the density of states being greater for the
majority spin sub-band give the main contribution to the TMR effect. We show
that, due to interfacial inter-band scattering, the TMR can be substantially
reduced even down to zero value. This is related to the fact that delocalized
quasi-free electrons can scatter into the strongly localized d sub-band with
the density of states at the Fermi energy being larger for minority spins
compared to majority spins. It is also shown that spin-flip electron scattering
on the surface magnons within the interface leads to a further decrease of the
TMR at finite temperature.Comment: REVTeX4, 20 pages, 9 figures, 1 table, submitted to Phys.Rev.B; In
Version 2 the text is substantially improved, the main results and
conclusions left the sam
Impact of Nerve-Sparing Status on Positive Surgical Margin Location and Biochemical Recurrence in Patients with Prostate Cancer Post Radical Prostatectomy
977 Influence of 1-year androgen deprivation therapy on lipid and glucose metabolism in patients with newly diagnosed prostate cancer
Supplementary Material for: A Case of Adult Metastatic Rhabdomyosarcoma of the Prostate Cured by Long-Term Chemotherapy with Local Radiation
<p>A 32-year-old man visited our hospital due to urinary retention.
Prostate-specific antigen was 13.7 ng/mL. Imaging examinations showed a
large prostatic tumor and lung and internal iliac lymph node metastases.
Transrectal biopsy confirmed embryonal rhabdomyosarcoma of the prostate
classified as cT2bN1M1 (stage IV) by the International Rhabdomyosarcoma
Study (IRS) Group staging system. Systemic chemotherapy was started
according to the IRS III regimen 36, which consisted of 16 weeks of
induction chemotherapy with radiation. After 20 weeks, magnetic
resonance imaging showed the disappearance of metastases, and the
prostate tumor shrunk markedly. Moreover, prostatic re-biopsy showed no
viable tumor cells. Maintenance chemotherapy, excluding vincristine
because of severe peripheral nerve disorder, was performed for 2 years.
There has been no recurrence for 49 months after the termination of
maintenance chemotherapy. To the best of our knowledge, this is the
longest surviving case of adult-onset metastatic rhabdomyosarcoma of the
prostate reported in the literature.</p
Measurement of the Dynamical Dipolar Coupling in a Pair of Magnetic Nanodisks Using a Ferromagnetic Resonance Force Microscope
Clinical significant prostate cancer diagnostic performance of LacdiNAc-prostate-specific antigen glycoisomer assay at initial prostate biopsy: Retrospective multi-institutional study
Clinical significance of the LacdiNAc-glycosylated prostate-specific antigen assay for prostate cancer detection
To reduce unnecessary prostate biopsies (Pbx), better discrimination is needed. To identify clinically significant prostate cancer (CSPC) we determined the performance of LacdiNAc-glycosylated prostate-specific antigen (LDN-PSA) and LDN-PSA normalized by prostate volume (LDN-PSAD). We retrospectively measured LDN-PSA, total PSA (tPSA), and free PSA/tPSA (F/T PSA) values in 718 men who underwent a Pbx in 3 academic urology clinics in Japan and Canada (Pbx cohort) and in 174 PC patients who subsequently underwent radical prostatectomy in Australia (preop-PSA cohort). The assays were evaluated using the area under the receiver operating characteristics curve (AUC) and decision curve analyses to discriminate CSPC. In the Pbx cohort, LDN-PSAD (AUC 0.860) provided significantly better clinical performance for discriminating CSPC compared with LDN-PSA (AUC 0.827, P = 0.0024), PSAD (AUC 0.809, P = 7. Limitations include limited sample size, retrospective nature, and no family history information prior to biopsy. LacdiNAc-glycosylated PSA is significantly better than the conventional PSA test in identifying patients with CSPC. This study was approved by the ethics committee of each institution ("The Study about Carbohydrate Structure Change in Urological Disease"; approval no. 2014-195)