物理学报
物理學報
물이학보
2013年
4期
142-148
,共7页
低温波荡器%Nd2Fe14B永磁铁%低温%磁特性
低溫波盪器%Nd2Fe14B永磁鐵%低溫%磁特性
저온파탕기%Nd2Fe14B영자철%저온%자특성
cryogenic undulator%Nd2Fe14B permanent magnet%cryogenic%magnetic properties
用综合物性测量系统测试了国产Nd2Fe14B (N50M)永磁铁在低温下(10—300 K)的M-H 和M-T.获得了N50M剩磁Br和内禀矫顽力Hci在低温下的变化图,对其取向度和三维磁化强度进行了分析研究.结果表明, N50M在80—150 K发生强烈自旋再取向效应, Br在120—130 K出现峰值, Hci随温度下降呈线性增加.在130 K, Br和Hci分别比常温(300 K)增加15.6%和220%,达到1.65 T和3638 kA/m.在150—300 K,随温度下降, N50M宏观取向度与外磁场均匀性逐步改善,但在80—235 K,微观外磁场均匀性恶化.实验研究发现,235 K附近, N50M垂直取向方向呈现“剩余磁化强度跳跃”.研究结果为上海光源II期低温波荡器及其他高精度低温永磁仪器与设备的物理设计提供了参考.
用綜閤物性測量繫統測試瞭國產Nd2Fe14B (N50M)永磁鐵在低溫下(10—300 K)的M-H 和M-T.穫得瞭N50M剩磁Br和內稟矯頑力Hci在低溫下的變化圖,對其取嚮度和三維磁化彊度進行瞭分析研究.結果錶明, N50M在80—150 K髮生彊烈自鏇再取嚮效應, Br在120—130 K齣現峰值, Hci隨溫度下降呈線性增加.在130 K, Br和Hci分彆比常溫(300 K)增加15.6%和220%,達到1.65 T和3638 kA/m.在150—300 K,隨溫度下降, N50M宏觀取嚮度與外磁場均勻性逐步改善,但在80—235 K,微觀外磁場均勻性噁化.實驗研究髮現,235 K附近, N50M垂直取嚮方嚮呈現“剩餘磁化彊度跳躍”.研究結果為上海光源II期低溫波盪器及其他高精度低溫永磁儀器與設備的物理設計提供瞭參攷.
용종합물성측량계통측시료국산Nd2Fe14B (N50M)영자철재저온하(10—300 K)적M-H 화M-T.획득료N50M잉자Br화내품교완력Hci재저온하적변화도,대기취향도화삼유자화강도진행료분석연구.결과표명, N50M재80—150 K발생강렬자선재취향효응, Br재120—130 K출현봉치, Hci수온도하강정선성증가.재130 K, Br화Hci분별비상온(300 K)증가15.6%화220%,체도1.65 T화3638 kA/m.재150—300 K,수온도하강, N50M굉관취향도여외자장균균성축보개선,단재80—235 K,미관외자장균균성악화.실험연구발현,235 K부근, N50M수직취향방향정현“잉여자화강도도약”.연구결과위상해광원II기저온파탕기급기타고정도저온영자의기여설비적물리설계제공료삼고.
M-H and M-T curve at cryogenic (10–300 K) of domestic Nd2Fe14B (N50M) permanent magnet are tested by physical property measurement system (PPMS). Br-T and Hci-T figure under the cryogenic condition for N50M are obtained. The orientation degree and three-dimensional magnetization are also analyzed and researched under the cryogenic conditon. The results show that N50M has a strong spin reorientation effect(SRT) between 80 and 150 K, Br shows a peak between 120 and 130 K and Hci increases linearly with temperature decresing. At 130 K, Br increases 15.6% and Hci increases 220% compared with at room temperature (300 K), reaching 1.65 T and 3638 kA/m respectively. Between 150 and 300 K, with temperature declining, the macroscopic orientation degree uniformity and the external magnetic field uniformity of N50M are improved gradually. Between 80 and 235 K, the micro-external magnetic field uniformity shows a deterioration phenomenon. The experimental research also indicates that near 235 K the N50M perpendicular to orientation direction presents a“remanent magnetization jump”phenomenon. The experimental results provide a reference for the physical design of cryogenic undulator for Shanghai Synchrotron Radiation Facility II and other high-precision cryogenic permanent magnet instruments and equipment.
