Search

The compensated ferrimagnetic insulator Gd3Fe5O12 (GdIG) with a magnetization compensation point (TM ∼ 286 K) near room temperature has recently gained significant attention because of its long spin transmission length and absence of Ohmic loss. However, previously reported GdIG films with perpendicular magnetic anisotropy have a TM far below room temperature, which is unfavorable for practical applications. Here, we show the tuning of TM from 268 to 303.7 K in perpendicularly magnetized 15 nm GdIG films epitaxially grown on (111) Gd3Sc2Ga3O12 by manipulating the epitaxial strain through controlling the rapid cooling temperature during the annealing process. By varying the film thickness between 5 and 40 nm, the TM of the film can be further extended to a range of 246–380 K. We have also demonstrated highly efficient switching of the GdIG spin-sublattices driven by current at room temperature in the GdIG/Pt heterostructures with various TM values, especially with TM slightly higher than 300 K. Our findings reveal potential opportunities for insulating compensated ferrimagnetic films of GdIG in the development of high-density, high-speed, and energy-efficient spintronic devices. [ABSTRACT FROM AUTHOR]

Background: Autoimmune encephalitis (AE) is a noninfectious emergency with severe clinical attacks. It is difficult for the earlier diagnosis of acute AE due to the lack of antibody detection resources. Purpose To construct a deep learning (DL) algorithm using multi‐sequence magnetic resonance imaging (MRI) for the identification of acute AE. Study Type: Retrospective. Population: One hundred and sixty AE patients (90 women; median age 36), 177 herpes simplex virus encephalitis (HSVE) (89 women; median age 39), and 184 healthy controls (HC) (95 women; median age 39) were included. Fifty‐two patients from another site were enrolled for external validation. Field Strength/Sequence: 3.0 T; fast spin‐echo (T1WI, T2WI, fluid attenuated inversion recovery imaging) and spin‐echo echo‐planar diffusion weighted imaging. Assessment Five DL models based on individual or combined four MRI sequences to classify the datasets as AE, HSVE, or HC. Reader experiment was further carried out by radiologists. Statistical Tests: The discriminative performance of different models was assessed using the area under the receiver operating characteristic curve (AUC). The optimal threshold cut‐off was identified when sensitivity and specificity were maximized (sensitivity + specificity − 1) in the validation set. Classification performance using confusion matrices was reported to evaluate the diagnostic value of the models and the radiologists' assessments before being assessed by the paired t‐test (P < 0.05 was considered significant). Results: In the internal test set, the fusion model achieved the significantly greatest diagnostic performance than single‐sequence DL models with AUCs of 0.828, 0.884, and 0.899 for AE, HSVE, and HC, respectively. The model demonstrated a consistently high performance in the external validation set with AUCs of 0.831 (AE), 0.882 (HSVE), and 0.892 (HC). The fusion model also demonstrated significantly higher performance than all radiologists in identifying AE (accuracy between the fuse model vs. average radiologist: 83% vs. 72%). Data Conclusion: The proposed DL algorithm derived from multi‐sequence MRI provided desirable identification and classification of acute AE. Level of Evidence: 3 Technical Efficacy: Stage 2 [ABSTRACT FROM AUTHOR]

The compensated ferrimagnetic insulator Gd3Fe5O12 (GdIG) with a magnetization compensation point (TM ∼ 286 K) near room temperature has recently gained significant attention because of its long spin transmission length and absence of Ohmic loss. However, previously reported GdIG films with perpendicular magnetic anisotropy have a TM far below room temperature, which is unfavorable for practical applications. Here, we show the tuning of TM from 268 to 303.7 K in perpendicularly magnetized 15 nm GdIG films epitaxially grown on (111) Gd3Sc2Ga3O12 by manipulating the epitaxial strain through controlling the rapid cooling temperature during the annealing process. By varying the film thickness between 5 and 40 nm, the TM of the film can be further extended to a range of 246–380 K. We have also demonstrated highly efficient switching of the GdIG spin-sublattices driven by current at room temperature in the GdIG/Pt heterostructures with various TM values, especially with TM slightly higher than 300 K. Our findings reveal potential opportunities for insulating compensated ferrimagnetic films of GdIG in the development of high-density, high-speed, and energy-efficient spintronic devices. [ABSTRACT FROM AUTHOR]

The objective of the present study was to compare the clinical results of the surgical versus nonsurgical treatments of acute primary patellar dislocations with a medial patellofemoral ligament (MPFL) injury in the nonoverlap region with the vastus medialis oblique. In this study, 62 patients with an acute patellar dislocation and a concurrent MPFL injury in the nonoverlap region were randomly divided into two groups based on their birth years (even vs. odd years) and received either surgical or nonsurgical treatment. Of the 62 eligible patients, 30 were in the nonsurgical treatment group (Group 1) and 32 were in the surgical group (Group 2). Patellar stability tests and the Kujala knee questionnaire were performed, and radiographs were evaluated for patellar tilt and the lateral shift ratio by two blinded investigators. An osteochondral injury was noted in six (23.1%) patients from Group 1 and five (16.7%) patients from Group 2, with no statistical difference between the two groups. The mean Kujala score was 80.19 ± 5.07 and 93.57 ± 4.03 ( p  < 0.001) between the surgical and nonsurgical groups, respectively. The mean patellar tilt was 8.96 ± 1.64 and 6.83 ± 1.44 degrees ( p  < 0.001) and the lateral shift ratio was 11.08 ± 1.99 and 9.23 ± 1.96 ( p  = 0.001) between the surgical and nonsurgical groups, respectively. This study showed that the surgical treatment of MPFL injuries in the nonoverlap region achieved better clinical outcomes and improved subjective knee function compared with conservative therapy. Surgery should therefore be considered as the treatment of choice for these specific injuries., (Thieme Medical Publishers 333 Seventh Avenue, New York, NY 10001, USA.)