國 口我们将磁的一切归于电流：自由电流、分子电流、电子电流 ▣自然界中一切跟磁性有关的物质我们就置若罔闻？ 口更丰富的物理在于这些到目前为止置若罔闻的地方！ 口量子力学：自旋！ 口统计物理与相变：自旋模型！ 口铁磁学：量子力学+固体物理！ 口自旋电子学：自旋作为信息载体！ 口。0。。。0
我们将磁的一切归于电流：自由电流、分子电流、电子电流 自然界中一切跟磁性有关的物质我们就置若罔闻？ 更丰富的物理在于这些到目前为止置若罔闻的地方！ 量子力学：自旋！ 统计物理与相变：自旋模型！ 铁磁学：量子力学+固体物理！ 自旋电子学：自旋作为信息载体！
國 愿意的同学可以编程序来算一算！ ▣Ising model 2 kBTe/J= ≈2.269 ln(1+v2) H=- ∑SS-h∑S,S,=±l 2 <i,j> <i>
Ising model J S S h S , S 1 21 H i i i i, j i j 愿意的同学可以编程序来算一算！
國 Material magnetized to saturation by Magnetization alignment of domains. of material M When driving magnetic field drops to zero,the ferromagnetic materia retains a considerable degree of The material follows a non-linear magnetization.This is useful as a magnetization curve when magnetic memory device. magnetized from a zero field value. 第七章磁介质 Applied magnetic 母H field intensity The driving magnetic field must be reversed and increased to a large value to drive the magnetization to The hysteresis loop shows the "history zero again. dependent"nature of magnetization of a 图 ferromagnetic material.Once the material has been driven to saturation, the magnetizing field can then be Toward saturation in dropped to zero and the material will the opposite direction retain most of its magnetization (it remembers its history)
第七章 磁介质
國 Diamagnetism: property of all matter Uncompensated Electronic orbital and spin bands in angular metals momentum Pauli spin Band Band Permanent atomic paramagnetism antiferromagnetism ferromagnetism moments Independent Cooperating atomic atomic moments moments Ideal paramagnetism Ferromagnetism Antiferromagnetism Ferrimagnetism
圆电磁学07-01：磁介质实验现象 口回顾电介质物理： 极性分子 非极分子 无外场时： ● 有外场时： 取向极化 位移极化 1 电介质内部需要由两个物 理量E和P来描述
电磁学07-01: 磁介质实验现象 回顾电介质物理：