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智科眼: 双语看懂新科研
光学与光子学 47
In(In) conventional(传统) electron microscopes(电子显微镜),(,) performing(进行) atomic(原子)-()resolution(分辨率) observations(观察) of(of) magnetic materials(磁性材料) is(is) particularly(特别) difficult(困难) because(因为) high() magnetic fields(磁场) are(are) inevitably(不可避免地) exerted(产生) on(on) samples(样品) inside() the magnetic(磁场) objective lens(物镜).(.) Newly() developed(开发) magnetic(磁场) objective-lens(物镜) system(系统) provides(提供) a(a) magnetic-field(磁场)-()free() environment(环境) at(at) the sample(样品) position(位置).(.) This() enables(使得) direct(直接),(,) atom(原子)-()resolved(分辨) imaging(成像) of(of) magnetic materials(磁性材料) such(such) as() silicon steels(硅钢).(.) This() novel(新型) electron microscope(电子显微镜) is(is) expected(有望) to(to) be(be) extensively(广泛) used(用于) for(for) the research(研究) and() development(开发) of(of) advanced(先进) magnetic materials(磁性材料).(.)
Under(Under) the JST-SENTAN(JST-SENTAN) program(计划) ((()Development(开发) of(of) System(系统) and() Technology(技术) for(for) Advanced(高级) Measurement(测量) and() Analysis(分析),(,) Japan(日本) Science(科学) and() Technology(技术) Agency(机构)),(),) the joint(联合) development(开发) team(团队) of(of) Prof(教授) .(.) Naoya(Naoya) Shibata(Shibata) at(at) the University(大学) of(of) Tokyo(东京) and() JEOL(JEOL) Ltd(Ltd).,(.,) has(具有) developed(开发) a(a) revolutionary(革命性) electron microscope(电子显微镜) that(that) incorporates() newly() designed(设计) magnetic(磁场) objective lenses(物镜),(,) and() achieved(实现了) direct(直接),(,) atom(原子)-()resolved(解决) imaging(成像) of(of) materials(材料) with(with) sub()() spatial resolution(空间分辨率),(,) with(with) a(a) residual(残余) magnetic field(磁场) less() than(than) 0.2(0.2) mT() at(at) the sample(样品) position(位置).(.) To(To) the best(最好) of(of) our(我们) knowledge(),(,) this(这一) is() the first(第一) time() that(that) such(such) a(a) goal(目标) has(has) been(been) achieved(实现).(.)
In(In) the 88(88) years() since() the seminal(开创) invention(发明) of(of) the transmission(透射) electron microscope(电子显微镜) (TEM)((TEM)) in(in) 1931,(1931,) researchers(研究人员) have(have) continually(不断) pursued(寻求) better(更好) spatial resolution(空间分辨率).(.) The design(设计) of(of) magnetic(磁性) objective lenses(物镜) with(with) smaller(较小) lens(透镜)-()aberration(像差) coefficients(系数) has(具有) been(been) necessary(必要),(,) and(并且) aberration(像差)-()correcting(校正) lens() systems(系统) for(for) scanning(扫描) TEM(TEM) (STEM)((STEM)) have(have) achieved(实现了) sub()() spatial resolution(空间分辨率).(.)
One(一个) critical(关键) disadvantage(缺点) of(of) current(当前) magnetic(磁场) condenser(聚光器)-()objective-lens(物镜) systems(系统) for(for) atomic(原子)-()resolution(分辨率) TEMs/STEMs(TEMs/STEMs) is() that(that) the samples(样品) must(必须) be(be) inserted(插入) into(into) very(非常) high magnetic fields(强磁场) of(of) up(up) to(to) 2–3(2–3) T(T) .(.) Such(这样) high() fields(领域) can(可以) severely(严重) hamper(妨碍) atomic(原子)-()resolution(分辨率) imaging(成像) of(of) many(许多) important(重要) soft()/(/)hard magnetic materials(硬磁材料),(,) such(such) as(因为) silicon steel(硅钢),(,) because(因为) the strong() field() can() greatly(极大) alter(改变)—or(—or) even(甚至) destroy(破坏)()the material(材料)'s('s) magnetic(磁性) and() sometimes(有时) physical structure(物理结构).(.) Recently(最近),(,) the development(发展) of(of) new(新型) magnetic materials(磁性材料) has(has) advanced(先进) rapidly(迅速).(.) As(As) atomic(原子)-()scale() structural analysis(结构分析) is() key(关键) to(to) the aforementioned(上述) technology(技术),(,) a(a) solution(解决) to(to) this() problem(问题) has(has) long(长期) been(been) required(需要).(.)
The joint(联合) team(团队) has(has) developed(开发) a(一种) new(新的) magnetic-field(磁场)-()free() objective-lens(物镜) system(系统),(,) containing(包含) two(两个) round(圆形) lenses() positioned(定位) in(in) an(an) exact(精确) mirror(镜像)-()symmetric(对称) configuration(配置) with(with) respect(方面) to(to) the sample(样品) plane(平面).(.) This(这种) new(新的) lens(透镜) system(系统) provides(提供) extremely() small() residual(残余) magnetic fields(磁场) at(at) the sample(样品) position(位置) while(同时) placing(放置) the strongly(强烈) excited(激发) front()/(/)back() objective lenses(物镜) close(靠近) enough(足够) to(to) the sample(样品) to(to) obtain(获得) the short() focus(焦距) length(长度) condition(条件) indispensable(必不可少) for(for) atomic(原子)-()resolution(分辨率) imaging(成像).(.) Consequently(因此),(,) the residual(残留) magnetic fields(磁场) generated(产生) near() the sample(样品) center(中心) are(are) much(much) <0.2(<0.2) mT,(mT,) which(which) is(is) 10,000(10,000) times() smaller() than(than) the value() in(in) conventional(常规) magnetic(磁场) objective lenses(物镜) used(用于) for(for) atomic(原子)-()resolution(分辨率) TEM/STEM(TEM/STEM) imaging(成像).(.)
The joint(联合) team(小组) has(has) used(利用) this(这一) new() system(系统) to(to) observe(观察) the atomic structure(原子结构) of(of) a(a) grain-oriented(晶粒取向) silicon-steel sheet(硅钢片),(,) which(which) is() one(之一) of(of) the most() important(重要) soft() magnetic() engineering materials(工程材料).(.) This() sheet(片材) is(is) used() as(as) a(a) core(核心) material(材料) for(for) electric transformers(变压器) and(并且) motors(电动机),(,) and() its(它的) atomic(原子)-()resolution(分辨率) characterization(表征) of(of) individual() defects(缺陷) has(has) long(长期) been(been) sought(寻求).(.) Using(使用) the newly() developed(开发) lens(透镜) system(系统),(,) the resolved(分辨) atomic structure(原子结构) of(of) the silicon steel(硅钢) was(was) clearly(清晰地) observed(观察),(,) and(并且) direct(直接),(,) atom(原子)-()resolved(分辨) imaging(成像) in(in) a(a) magnetic-field(磁场)-()free() environment(环境) was(was) realized(实现了) for(for) electron(电子) microscopy(显微镜),(,) enabling(实现) unprecedented(前所未有) atomic(原子)-()level() structural(结构) characterization(表征) of(of) magnetic materials(磁性材料).(.)
The newly() developed(开发) electron microscope(电子显微镜) can(可以) be(be) operated(操作) in(in) the same(相同) manner(方式) as(as) that(that) of(of) conventional(传统) TEMs/STEMs.(TEMs/STEMs.) It() is(is) expected(预计将) to(to) promote(促进) substantial(大量) further(进一步) research(研究) and() development(开发) in(in) various(各种) nanotechnology(纳米技术) fields(领域).(.)

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